Playfulness (ie, being and acting playful) is increasingly recognized as important for older adults’ health, well-being, and dignity, even in contexts of illness or institutional care. Yet, research and practice still lack validated instruments that capture this phenomenon from the perspective of older adults themselves. In this study protocol, we describe a research program organized into 2 interrelated phases (Figure 1). The first phase explores the lived experience and meanings of playfulness in later life, while the second focuses on the development and psychometric evaluation of a new instrument (Play and Supportive Environments [PLAY-SE]). To facilitate this process, the protocol provides conceptual clarifications of playfulness and play, as well as an initial conceptualization of the domains to be included in the instrument.

Although being playful and acting playfully are often associated with childhood, studies show that playfulness remains a stable trait across the lifespan, with older adults not inherently less interested in playful engagement [1-3]. Nevertheless, dominant life-course frameworks have traditionally linked playfulness to childhood, socialization to adolescence, work to adulthood, and passive leisure to old age, which has contributed to limited research attention on playfulness in later life [4]. Expanding this view is important, as playfulness in later life has been linked to well-being, creativity, cognitive health, and social connectedness [4,5].

Being and acting playfully are closely tied to a person’s sense of identity, purpose, and relational connectedness [6], core components of person-centered care as articulated by McCormack and McCance [7]. Their framework emphasizes 4 modes of being: being with self, being in relation, being in a social world, and being in place. Engaging in playful activities or expressing a playful attitude may facilitate all these dimensions, thereby supporting the dignity, autonomy, and well-being of older adults in care. In contexts where daily routines are often shaped by institutional or structured living environments, playfulness can represent a moment of agency (ability to act independently, make choices) and self-expression [8,9].

Being and acting playful can also be understood through an existential lens. According to Merleau-Ponty [10], the body is the primary site of being in the world. In situations where mobility or independence is compromised, opportunities for unreflective participation in playful activities may diminish. Nonetheless, playfulness as an attitude or mode of being may remain accessible and vital, offering continuity and meaning even during times of change. This perspective reinforces the importance of enabling older adults to express their playfulness, even within the constraints of care environments.

In the context of municipal care, older adults living in long-term care facilities often report limited access to meaningful, self-chosen activities and social engagement. Both a Swedish report [11] and international studies [12,13] highlight widespread boredom, monotony, and passivity—conditions that stand in contrast to legal aims for an active and meaningful life in the community [14]. At the same time, international research suggests that playfulness may contribute to physical, emotional, and social well-being throughout the lifespan [15-17].

A structured exploratory literature review was conducted in May 2025 using the research platform Elicit [18], which applies large-scale paper search and screening based on predefined inclusion criteria. The guiding research question was: “What perspectives do older adults (65 years or older) have on playfulness and play, and what measures have been developed with a special focus on playfulness and play for older adults? In addition, what dimensions of play and/or playfulness are captured by these measures?” The search strategy included both the terms playfulness and play, since playfulness is often described as a state characterized by elements of play [19].

The search was conducted within the Semantic Scholar corpus (>126 million academic papers) and retrieved the 50 most relevant records, which were screened according to population age, study focus, study design, and relevance. Ten studies were initially included from this screening process. In addition, 3 studies were identified through backward citation tracking. The final sample comprised qualitative interview and participatory design studies [8,9,20-22], quantitative survey-based investigations [2,3,23,24], instrument development studies [25-27], and 1 narrative review [28]. From these, 3 validated instruments assessing playfulness in older adults were identified: the Older Adult Playfulness Scale (OAP) [27], the Other-Directed, Light-Hearted, Intellectual, and Whimsical (OLIW) Playfulness Scale [23], and the Short Measure of Adult Playfulness (SMAP) [2]. The following sections summarize the findings from this review, beginning with perspectives on play and playfulness among older adults and continuing with validated measures used in this field.

Older adults describe play and playfulness as multidimensional constructs encompassing cognitive, emotional, social, and psychological aspects. These dimensions are associated with identity, continuity, and vitality in later life [2,8,20]. For example, in an interview study of older adults aged 62 to 89 (mean age 74 y), play was described as a source of enjoyment, structure, and personal meaning in everyday life [9].

Studies link playfulness to well-being, showing that it helps older adults reframe everyday challenges, maintain social ties, and support mental and physical health. In a study of persons aged 50 to 98 years, higher playfulness was associated with greater life satisfaction and flourishing [3]. Similarly, a survey study involving participants aged 60 years and older found that self-reported playfulness, especially in social contexts, was positively correlated with well-being [23].

Recent research has further strengthened this empirical foundation. For example, Brauer et al [3] demonstrated positive associations between playfulness and life satisfaction, character strengths, and flourishing in middle and older age, while Clifford et al [24], in a general adult sample, found that playfulness was linked to adaptive coping and reduced stress. Although not restricted to older adults, these findings reinforce the relevance of playfulness as a health-related resource across adulthood and into later life.

Qualitative studies also shed light on the significance of play. Burr et al [8], through in-depth interviews with older adults (aged 69‐88 y, mean age 81 y, SD 6.06 y), emphasized play’s role in shaping life narratives and creating meaning. Schutter and Abeele [20,21] used contextual inquiries and participatory design methods with participants aged 68 to 80 years and 50 to 72 years to explore how older adults perceive meaningful play, particularly in digital contexts. These studies found that play supports connectedness, nurtures the self and others, and enables meaningful societal engagement through shared experiences and intergenerational interaction.

Play in digital environments has also been explored through ethnographic and participatory design studies. Sayago et al [22] demonstrated that older adults (aged 60‐85 y) actively engage in cocreating digital play experiences, possibly challenging ageist assumptions. In addition, Loos [28], in a literature review, identified social interaction, usability, and enjoyment as key motivators for engaging with exergames and digital play platforms.

Across both qualitative and quantitative studies, the social aspect of playfulness, especially the “other-directed” facet (enjoyment of others’ company and using playfulness to create positive social interactions), is consistently highlighted. This includes using humor and lightheartedness to foster relationships and navigate social tensions [3,23]. Themes such as connectedness, continuity, and participation also emerged in qualitative narratives, highlighting play’s role in enhancing older adults’ sense of agency and well-being [9,20].

Three validated instruments were identified in the review as being used to assess playfulness in older adults:

Taken together, qualitative studies highlighting meaning, continuity, and connectedness [8,9,20,21] and quantitative research linking playfulness with well-being [2,3,23] suggest that playfulness in older age is complex, contextual, and relational. However, existing instruments primarily conceptualize playfulness as a personality trait and have been developed for general adult populations. They place less emphasis on how playfulness is enacted in everyday life within care contexts or on how environmental and functional constraints may shape this expression.

Valid and age-sensitive instruments, responsive to functional limitations and municipal care environments, are therefore needed to capture these nuances in both research and practice. PLAY-SE will be grounded in older adults’ lived experiences within Swedish municipal care and will integrate perspectives from caring science and person-centered care. It will be developed with explicit Rasch-based psychometric intentions to ensure appropriate targeting and invariant measurement in this specific population. For these reasons, adaptation of existing instruments was considered insufficient to meet the conceptual and methodological aims of this research program.

This program will be conducted from a person-centered perspective, emphasizing the ethical aim of a good life, lived with and for others, within fair and equitable institutions [29]. To explore playfulness in older adults living in long-term care facilities, we apply the 4 modes of being a person: being with self, being in relation, being in a social world, and being in place, as described by McCormack and McCance [7]. In addition, existential philosophy provides a lens through which human beings are not seen as predetermined. Although factual limitations shape our lives, they do not ultimately define who we are. Instead, we are always self-making beings, responsible for the meanings we give through our choices, the totality of which makes us who we are [30]. In caring science, this tension between determinism and freedom is understood as the interplay of vulnerability and freedom [31].

To achieve research depth that embraces lived experiences as meanings, a phenomenological reflective lifeworld research (RLR) approach will be adopted (in the first phase of the program), as outlined by Dahlberg et al [32]. In this way, the program will explore older adults’ lived experiences of being playful while living in long-term care facilities. In RLR, the phenomenon is the central focus and is described through its essential meaning and constituents. The approach draws on the philosophical underpinnings of hermeneutics and phenomenology as described by Gadamer [33], Husserl [34], and Merleau-Ponty [10].

RLR provides methodological principles such as openness, flexibility, and bridling. Openness deals with the demand for sensitivity to the phenomenon being studied and entails having the capacity to be surprised and sensitive to the unpredictable and unexpected. Through this open attitude, the objects of the lifeworld may reveal themselves as different from how they were previously assumed to be [32]. To bridle means to openly return to the things themselves without making definitive what is indefinite, so as not to understand too quickly. In addition, within the bridling attitude, one moves beyond natural understanding and restrains one’s preunderstanding, including personal beliefs, theories, and other assumptions, so that they do not mislead the understanding of meaning.

As part of the program, the PLAY-SE instrument will be developed at the end of phase 1 and refined and evaluated during phase 2 (Figure 1). The development of a psychometric instrument typically begins with qualitative conceptualization [35], where the construct of interest (eg, playfulness) is explored through interviews, observations, and/or literature reviews to ensure content is grounded in lived experience (phase 1). Based on these insights, developers generate domains and items that reflect different facets or levels of the construct, along with a response format suited to capture variation in intensity or frequency. To enable measurement on a hierarchical scale or “ruler,” items should ideally vary in difficulty or endorsement level, allowing for ordering along a unidimensional latent trait. In this way, the qualitative and theoretical work contributes to defining an outcome space [36], that is, a structured representation of the range and organization of possible expressions of playfulness, ranging from lower to higher levels, from being playful to acting playfully. This is followed by pilot testing and psychometric evaluation using approaches such as Rasch model analysis, which assesses item fit, scale targeting, and unidimensionality, thereby supporting the creation of an interval-level measure. Final validation typically includes analyses of reliability, validity, and responsiveness across diverse samples [35,36].

Psychometrics is the scientific study of measurement instruments, such as rating scales [37]. Traditional approaches, often referred to as CTT, rely on correlation-based techniques such as Cronbach α, principal component analysis, and factor analysis [37,38]. Although widely used, CTT assumes normally distributed, continuous data, does not ensure invariant measurement across persons or contexts, and treats summed scores as interval-level data, which limits generalizability and validity [39]. Rasch measurement theory (RMT), by contrast, offers a probabilistic framework within modern test theory [40]. By modeling the probability of endorsing an item based on person ability and item difficulty, Rasch model analysis enables unidimensional, invariant, and interval-level measurement. Its grounding in measurement principles comparable to the physical sciences allows for alignment between individual- and group-level structures, leading some to regard the Rasch model as the ideal standard for scientific measurement [41-43]. This approach enables quality-assured comparisons both within individuals over time and between individuals [44]. Consequently, RMT provides a foundation for truly person-centered research, focusing on measurement with and for the individual person.

In this program, a distinction is made between playful activities (sometimes referred to simply as “play”) and playfulness, while recognizing that the terms are often used interchangeably in everyday conversation. Theoretically, however, they represent 2 related yet distinct constructs.

While playfulness can lead to playful activities, and playful activities may foster playfulness, they are not synonymous. In scientific research, it is valuable to distinguish between these concepts to avoid conceptual overlap and ensure analytical clarity. For instance, an older adult may retain a playful disposition (being playful) but be hindered from acting playfully due to situational and environmental circumstances, such as illness and institutional routines. In such circumstances, differentiating between inner orientation and outward expression becomes essential.

Moreover, “playful activities” may be understood as a broader construct than “play,” since it includes not only traditional forms of play (eg, games, hobbies, creative pursuits) but also everyday situations infused with humor, curiosity, or imagination. Recognizing these distinctions between being playful and acting playfully and between play and playful activities allows for a more nuanced understanding of how playfulness contributes to well-being in later life. This perspective also reflects prior research highlighting the multidimensional and contextual character of playfulness among older adults [2,3,8,19].

As part of this review and study protocol, an initial conceptualization and theoretical hierarchy for the PLAY-SE instrument were developed. This process drew on insights from the literature, together with conceptual reasoning, providing a theoretically grounded basis for the forthcoming item generation and psychometric evaluation. The conceptualization and hierarchy will be further elaborated in forthcoming discussions within the research team, drawing on findings from phase 1 and serving as a springboard for phase 2 of the program. The PLAY-SE will be a self-administered instrument comprising approximately 25 statements across 6 preliminary conceptual domains: : “Across the Life Course,” “Attitudes,” “Environment and Enablers,” “Emotional Meaning,” “Health and Well-being,” and “Playful Activity.” While designed for independent completion, support from staff should be offered, if needed, to ensure that all participants can engage with the instrument on their own terms. Higher scores will reflect greater levels of playfulness or engagement in play among older adults receiving municipal care (Figure 2).

Each domain will reflect a distinct aspect of the phenomenon and contribute to a comprehensive understanding of how playfulness may be experienced and expressed in later life. These domains are not only conceptually defined but also hypothetically arranged along a continuum, ranging from abstract attitudes and internalized values to embodied, enacted expressions of playfulness through playful activities. This structure reflects the idea that playfulness can manifest at different levels of engagement, “from potential to practice” (as illustrated in Figure 2). Further to the left indicates that it is easiest to agree with a statement (a lower degree of playfulness is required). Further to the right indicates that it is hardest to agree with a statement (a higher degree of playfulness is required).

Compared to existing measures (OAP, OLIW, SMAP), the proposed domains extend beyond trait-level orientations by explicitly capturing both being playful and acting playfully, as well as environmental enablers and constraints. In this way, PLAY-SE aims to reflect the lived experience of older adults in municipal care more fully than previous instruments, thereby addressing important gaps in the assessment of playfulness in later life.

This structure reflects the idea that playfulness can manifest at different levels of engagement, “from potential to practice” (as further explained in Table 1).

The 6 proposed domains for the PLAY-SE instrument are specifically designed to bridge older adults’ lived experiences with complex theoretical perspectives (such as person-centered care, lifeworld theory, and existential philosophy) by translating abstract concepts into dimensions that are both measurable and meaningful to the individual in their context. The domains collectively ensure that the instrument does the following:

Inspired by Huber et al [45] and the “hybrid model of concept development” [46], this program applies a hybrid model of concept development combined with an embedded mixed methods design. The hybrid model is particularly suited for refining and clarifying complex concepts by integrating theoretical insights with empirical observations. Concept development enhances conceptual clarity by identifying the essential attributes of a construct and translating them into measurable dimensions.

The hybrid model unfolds in 3 interrelated cycles (Figure 1):

The cycles are applied iteratively, meaning that quantitative findings from pilot testing and Rasch analysis may prompt further conceptual reflection to ensure alignment between empirical performance and theoretical meaning. Together, these cycles underpin the 2 phases of the PLAY-SE program: phase 1 (conceptual exploration) and phase 2 (instrument development and psychometric evaluation).

The program will be conducted in residential care facilities (ie, nursing homes) and in ordinary housing among persons receiving municipal care support in Sweden. Participants will include older adults aged 65 years and older, as well as activity coordinators and managers involved in municipal elder care.

Inclusion criteria (phase 1 and phase 2) were as follows:

Exclusion criteria (phase 1 and phase 2) were as follows:

Preliminary sample size of phase 1 (conceptual exploration) was as follows:

Preliminary sample size of phase 2 (instrument development and psychometric evaluation) was as follows:

A purposive sampling strategy will be used in phase 1 to ensure variation in gender, age, and relevant care contexts within municipal elder care. The aim is not statistical representativeness but conceptual variation to inform domain development, with particular emphasis on older adults living in residential care facilities.

For phase 2 (psychometric testing), a stratified sampling approach will be applied across multiple participating municipalities, including both urban and rural contexts. Recruitment will focus primarily on older adults receiving municipal care support in ordinary housing while ensuring sufficient variation in demographic and contextual characteristics. Eligible individuals will be invited consecutively or through structured random selection, where feasible. This approach aims to enhance representativeness within the intended target population while acknowledging practical constraints within municipal services.

To reduce recruitment bias, initial contact will be facilitated by designated care staff, but final eligibility confirmation and informed consent will be handled directly by the research team. Recruitment procedures will be documented to allow transparent reporting of participation rates and sample characteristics.

The planned sample sizes are based on methodological considerations specific to qualitative research, CTT, and RMT.

For the qualitative interviews in phase 1 (approximately 15‐25 older adults), the sample size is guided by the principle of conceptual saturation and information power, where the aim is depth and variation rather than statistical representativeness [32]. Recruitment will continue until thematic depth and conceptual clarity are achieved across variations in gender, care setting, and functional status.

For pilot testing (approximately 100 participants), the sample size is considered sufficient for preliminary evaluation under CTT, including the assessment of internal consistency, item-total correlations, floor and ceiling effects, and exploratory dimensionality [37,38,47]. Samples of around 100 participants are commonly recommended for early-stage scale refinement to identify poorly functioning items and evaluate reliability coefficients such as Cronbach α [38].

For large-scale validation (250‐500 participants), the sample size is aligned with recommendations for RMT. Samples of approximately 250 participants allow reasonably stable estimation of item difficulty parameters, while samples approaching 500 participants improve the precision of item calibration and enable robust testing of differential item functioning (DIF) across subgroups [48-50]. Larger samples also strengthen the evaluation of unidimensionality and local independence and support more precise targeting of the instrument [51].

Together, these staged sample sizes are intended to ensure conceptual validity in phase 1 and rigorous psychometric evaluation in phase 2, in line with best practice recommendations for scale development.

Participants will be recruited from both residential care facilities and ordinary housing with municipal home care support. Recruitment procedures will be adapted to each setting while maintaining consistent inclusion criteria. In residential care, responsible nurses or care managers will identify potentially eligible participants based on documented eligibility criteria and provide initial study information. In home care settings, recruitment will occur through designated contact persons within municipal services who distribute study information to eligible individuals. In all settings, final eligibility and informed consent will be confirmed directly by the research team to ensure voluntariness and comprehension.

Eligibility requires sufficient cognitive and communicative capacity to understand study information and provide informed consent. Formal cognitive screening instruments will not be administered as part of the study. Instead, the assessment of cognitive capacity will be based on structured clinical judgment conducted in collaboration with responsible nurses or care staff, drawing on documented cognitive status in medical records and their ongoing knowledge of the individual’s functioning.

The assessment will focus on the participant’s ability to do the following:

If uncertainty arises regarding decisional capacity, the individual will not be included. The basis for inclusion decisions will be documented to ensure procedural consistency.

The PLAY-SE instrument is designed for self-administration. However, given the target population, some participants may require assistance (eg, due to visual impairment or motor limitations). To ensure procedural consistency, assistance will follow a standardized protocol. Support will be limited to reading items aloud and recording responses as expressed by the participant, without interpretation, rephrasing, or prompting. The mode of administration (independent completion vs assisted completion) will be documented for each participant. This variable will be included in subsequent psychometric analyses.

Potential mode effects will be examined analytically. In the Rasch analysis, DIF will be tested across administration modes to determine whether assisted completion systematically influences item responses. If significant DIF is identified, its impact on measurement invariance will be evaluated.

Initial item development will be informed by the theoretical framework and the structured literature review described in this protocol, as well as by the research team’s clinical and methodological expertise within gerontological care [52]. In addition, qualitative findings from phase 1 will contribute empirical grounding through a structured process in which meaning units are identified, clustered into conceptual domains, and translated into candidate items.

While older adults’ lived experiences provide the empirical foundation for item content, item generation will not rely solely on participants’ verbatim expressions. In line with the notion of epistemic dialogue in patient-centered measurement [52], experiential knowledge will be treated as a vital but not self-sufficient source of evidence. Participants’ perspectives will inform item content and relevance, yet they will also be examined, conceptually refined, and integrated with theoretical frameworks (eg, person-centered care and lifeworld theory) and psychometric principles. In this way, the research team plays an active role in ensuring that items reflect both lived experience and a coherent construct suitable for rigorous measurement.

For each domain, an initial item pool (approximately 3‐5 items per domain) will be generated to capture varying levels of endorsement along the hypothesized continuum from lower to higher expressions of playfulness. Items will be formulated in Swedish using clear, concrete, and contextually appropriate language.

Item wording and content will be reviewed in 3 stages:

All decisions regarding item inclusion, modification, or exclusion will be documented to ensure transparency.

All stages of item development will be documented to ensure transparency and reproducibility. A structured decision log will be maintained throughout the development process, recording the origin of each item (eg, qualitative finding, theoretical refinement, or expert suggestion), revisions to wording, and the rationale for retention, modification, or exclusion.

During pilot testing and initial CTT analyses, the item pool will be retained in its entirety to preserve conceptual breadth. Early item removal will be avoided unless an item demonstrates clear redundancy or fundamental comprehension problems.

Subsequent Rasch analysis will provide a more rigorous evaluation of dimensionality, threshold functioning, item fit, and DIF. Decisions regarding item removal will be based on an integrated assessment of statistical performance and conceptual relevance. Items will not be removed solely on the basis of misfit statistics; instead, conceptual coverage, theoretical coherence, and construct validity will be weighed alongside empirical indicators.

This staged approach ensures that item reduction, if necessary, occurs only after a comprehensive psychometric evaluation and is supported by both measurement and conceptual considerations. The full decision process will be documented to provide a transparent audit trail linking qualitative findings, theoretical assumptions, and psychometric analyses to the final item selection.

Prespecified psychometric criteria have been defined to guide the evaluation and scale refinement of PLAY-SE. These criteria, grounded in established methodological literature, specify statistical thresholds and decision rules under both CTT and RMT (Table 2).

Given the advanced age and varying functional capacity of participants, some degree of missing data is anticipated. The extent and pattern of missing responses will be examined descriptively. If item-level missingness exceeds 10%, this will be analyzed to determine whether it reflects systematic difficulties (eg, item wording, administration mode, or functional limitations). In CTT analyses, cases with excessive missing responses may be excluded from specific analyses. In RMT, the model accommodates some degree of missing data under the assumption of conditional independence; however, patterns of missingness will be evaluated to ensure that they do not reflect systematic bias.

The PLAY-SE program is conducted in accordance with the ethical principles for research involving human subjects, as outlined by the Swedish Ethical Review Authority. Ethical considerations are made throughout the research program, in accordance with the Swedish Ethical Review Act [59] and the Declaration of Helsinki [60]. Ethical approval has been obtained for the qualitative work in phase 1 (registration number 2025-00211-01). A complementary application will be submitted before data collection for later milestones. All data will be handled in accordance with established ethical standards for privacy and confidentiality. No identifying information (eg, names, initials, or other personal identifiers) will be included in the manuscript or supplementary materials. No compensation will be offered to participants.

Participation is voluntary and based on informed consent. Only older adults capable of providing informed consent will be included, and participants may withdraw at any time without consequence. As participants are older adults receiving municipal care, they may constitute a potentially vulnerable group due to age-related functional limitations and dependency structures.

To minimize risks and safeguard voluntariness, several measures are implemented. Recruitment is facilitated by designated care staff to identify eligible individuals; however, study information, eligibility confirmation, and informed consent are handled directly by the research team to emphasize independence from care provision. Participants are explicitly informed that participation or nonparticipation will not influence their care in any way.

Participants choose the time and location of interviews to ensure a familiar and secure setting. Focus groups are conducted separately for managers and staff to reduce power imbalances. During questionnaire administration, staff will not be present unless necessary for practical support. Any assistance provided follows a standardized protocol limited to reading items aloud and recording responses without interpretation. Given the risk of social desirability bias in care contexts, mode of administration (independent vs assisted completion) will be documented and examined analytically through DIF testing.

As discussions about playfulness may evoke emotional responses, participants are offered follow-up contact if needed. Confidentiality is emphasized throughout, and all research data are pseudonymized or anonymized as appropriate, securely stored, and managed in accordance with applicable data protection regulations and institutional policies.

A reference group of older adults has been involved from the outset and remains engaged throughout the research process. This participatory approach supports the ethical commitment to treating participants as situated knowers and strengthens the contextual sensitivity of instrument development.

Findings from the PLAY-SE program will be disseminated through publication in peer-reviewed journals and presentation at national and international conferences. Summaries will be prepared for practitioners and older adults and shared with participating care units and municipal stakeholders to facilitate knowledge translation into practice.

This study protocol outlines a structured and theory-informed approach to conceptualizing and measuring playfulness among older adults receiving municipal care. By integrating qualitative exploration with systematic psychometric evaluation, the program seeks to address the lack of a context-sensitive instrument grounded in the lived experiences of older adults receiving municipal care.

A central contribution of the program lies in its sequential design. The qualitative studies in phase 1 provide an empirical foundation for item generation, ensuring that the conceptualization of playfulness is informed by older adults’ own narratives of being playful in everyday life. This integration of phenomenological inquiry and measurement development aligns with person-centered and lifeworld-oriented frameworks, in which individuals are understood as situated knowers whose experiences shape both meaning and practice. Grounding item development in qualitative findings is expected to strengthen content validity before proceeding to large-scale psychometric testing.

In contrast to existing measures of adult playfulness, which primarily assess trait-level dispositions, PLAY-SE is designed to capture both being playful and acting playfully within specific care contexts. The inclusion of environmental enablers and constraints reflects the theoretical assumption that playfulness in later life emerges in the interplay between personal orientation, bodily capacity, and contextual conditions. This contextual framing differentiates PLAY-SE from more general playfulness scales and may enhance its relevance for municipal care of older adults.

The protocol incorporates a staged psychometric evaluation plan. By applying both CTT and RMT, the study will examine dimensionality, reliability, targeting, and measurement invariance. Prespecified decision criteria for model fit, item retention, and DIF aim to enhance methodological transparency. Nevertheless, the ultimate adequacy of the instrument will depend on empirical performance in diverse samples.

Several methodological challenges must be acknowledged. Older adults receiving municipal care represent a heterogeneous population with varying cognitive and functional capacities. Ensuring accessibility while maintaining measurement precision requires standardized administration procedures and documentation of assistance during completion. Furthermore, as the instrument is initially developed within Swedish municipal contexts, its broader applicability will require subsequent cross-cultural validation.

If satisfactory measurement properties are established, PLAY-SE may support future research examining associations between playfulness, well-being, participation, and care quality. It may also inform intervention studies exploring playful engagement as a potential resource for existential well-being in later life. However, such applications remain contingent upon empirical validation.

In summary, this protocol describes a theoretically grounded and methodologically transparent pathway toward measuring playfulness in later life. By combining qualitative depth with psychometric rigor, it aims to support the development of a context-sensitive instrument for person-centered municipal elder care.

The literature review was conducted using a structured approach supported by the research platform Elicit. Although this tool enables broad concept-based search across a large academic corpus, it does not replace systematic database searches conducted across multiple bibliographic databases. As the review was intended to provide a focused conceptual overview rather than a formal systematic review, it may not have captured all relevant studies. Future research could benefit from a more comprehensive systematic search strategy across databases such as PsycINFO, PubMed, and CINAHL to further strengthen the empirical foundation.