Beyond the Diagnosis: Clinical Reasoning Through a Functional Lens

A diagnosis can provide valuable clinical information, but it cannot tell us everything we need to know about a child's occupational performance. It does not necessarily explain why a child can demonstrate a skill in one environment but struggle to access it in another, or why a familiar activity becomes difficult when demands increase.

As occupational therapists, our clinical reasoning must extend beyond the diagnostic label to consider the child's functional difficulties, the impact on daily occupations and the conditions that support or restrict participation.

This perspective is consistent with the Person–Environment–Occupation–Performance (PEOP) model, which recognises occupational performance as an interaction between the person, their environment and the occupations they engage in (Bass et al., 2024).

Consider a child who demonstrates age-appropriate fine motor skills during an individual assessment but struggles to complete written classroom tasks. If we focus only on the underlying motor skill, we may overlook the demands of the classroom, competing sensory information, fatigue, cognitive load or the level of support required to sustain engagement.

The important question is not simply whether the child possesses the skill, but whether they can access it reliably, use it meaningfully and sustain performance within the demands of everyday life.

This distinction matters because capacity and performance are related, but they are not interchangeable.

A child's demonstrated ability under supportive assessment conditions may differ considerably from their performance within a busy classroom, playground or family routine. Understanding these differences requires us to look beyond isolated skill development and examine the interaction between the child, the occupation and their environment.

Recent research reinforces the importance of this approach. Fischer et al. (2023), in a systematic review of occupation-based and occupation-focused paediatric interventions, identified promising but still limited evidence for improving participation through interventions embedded in meaningful everyday occupations. Their findings also highlight the need to evaluate participation outcomes, rather than assuming improvements in individual skills will automatically translate into everyday engagement.

This raises an important consideration for clinical practice. When we identify a functional difficulty, are we intervening primarily to improve an isolated component of performance, or are we working towards a meaningful occupational outcome?

For example, improving postural control may be relevant, but the occupational goal might be enabling a child to participate comfortably in classroom learning. Developing emotional regulation strategies may be important, but their value lies in helping the child access relationships, learning, play and everyday routines.

Environmental factors are equally significant. A 2025 scoping review by Turan and colleagues highlighted the influence of physical, social and service-related environmental factors on children's participation, reinforcing the importance of understanding participation within the child's real-world context.

Our intervention decisions therefore need to consider not only what the child is finding difficult, but what is limiting access to participation and what changes might make that participation possible.

Sometimes intervention involves developing a skill. Sometimes it requires modifying the environment, adjusting expectations, supporting co-regulation or providing temporary scaffolding. Often, effective intervention involves a thoughtful combination of these approaches.

This is where clinical reasoning becomes particularly important. Support must be responsive to the child's current capacity while remaining directed towards meaningful occupational outcomes.

As therapists, we need to recognise when a child is ready to learn, when they require additional support and when the demands of an occupation exceed the capacity currently available to them.

Ultimately, our role is not defined by the diagnosis a child carries, but by our ability to understand and address the functional difficulties affecting their everyday life.

The question is not simply, "What can this child do?" but "What enables this child to participate, and how can our intervention make that participation more accessible, sustainable and meaningful?"

This clinical reasoning underpins my developing work with The Regulation Hourglass™: understanding changing capacity and matching support to the child's current state, occupational demands, and opportunities for participation.

Because our goal is not simply skill acquisition. It is enabling children to use their developing abilities where and when those abilities matter most.

References

1. Bass, J. D., Marchant, J. K., de Sam Lazaro, S. L., & Baum, C. M. (2024). Application of the Person–Environment–Occupation–Performance Model: A scoping review. OTJR: Occupation, Participation and Health, 44(3). https://doi.org/10.1177/15394492241238951

2. Fischer, E., Green, D., & Lygnegård, F. (2023). Occupation as means and ends in paediatric occupational therapy – A systematic review. Scandinavian Journal of Occupational Therapy, 30(8), 1181–1198. https://doi.org/10.1080/11038128.2023.2188253

3. Turan, Z. C., Kayim, A., Engelen, A.-M., Sezer, K. S., Dunford, C., & Aki, E. (2025). Parental perspectives on environmental factors affecting participation of children with disabilities: A scoping review to inform inclusive healthcare and support services. Healthcare, 13(11), 1282. https://doi.org/10.3390/healthcare13111282