Ecology of Human Performance (EHP) - Key Concepts and Five Interventions

Ecology of Human Performance (EHP) is a theory and one of the ecological models used in OT. It provides a framework and a perspective from which a person views the world.
EHP is similar to other ecological models but includes distinctive elements, especially around the temporal environment and a unique description of task.
A core feature is the distinctive intervention plan that guides practice and enhances the OT approach.
In EHP, the environment is considered in its temporal dimension, and interactions among person, task, and environment shape performance.

The model emphasizes a perspective where the person is central and is surrounded by tasks and a broader context.
Task vs. Occupation:
- Task refers to what has been described as occupation in other models, but EHP uses the term task to be more broadly accessible across disciplines.
- Any activity that is available can be considered a task.
- The vocabulary of task allows easier translatability to multidisciplinary clinics.
Components of the model:
- Person: the individual whose performance is being evaluated.
- Task: the activity around which performance is organized (occupations in other models).
- Context/Environment: everything surrounding the person and task, including social, cultural, physical, and temporal aspects.
- Temporal Environment: a key component that includes lifespan development and timing for engaging in meaningful activities.
The performance range is conceptualized with the person at the center and tasks surrounding the person, all within the surrounding environment.
The model aims to understand how to enable engagement in meaningful activities by aligning person abilities, task demands, and contextual supports.

Temporal environment considerations include whether a person can engage in occupations across developmental stages and over time.
The interplay of person, task, and time influences whether meaningful activities can be performed.
The language of task zones in on broader occupational engagement beyond discipline-specific terminology.

The five interventions are: prevent, establish/restore, alter, modify/adapt, and create.
These interventions can be used singly, in combination, or across different stages of a case, providing flexibility and a structured framework for planning.
They support enhanced documentation and foster collaboration with families and multidisciplinary teams, as clients can participate in planning their interventions.
The interventions are designed to address the person, task, and environment in a holistic way and to promote a good fit among the three components.

Targets the person rather than the environment.
Focuses on developing and improving skills to enable task performance.
Example: increasing someone’s range of motion so they can perform a kitchen task that is hard to reach.
Emphasizes strengthening the person’s abilities to engage in the task.

Involves environmental approaches, grading, and sequencing to support task performance.
Emphasizes consideration of social, cultural, and temporal environments, not just the physical environment.
Examples:
- Returning to work and adjusting the environment or task demands.
- A child with ADHD: changes in social and cultural contexts to support performance.
Highlights the need to assess and modify environmental and contextual factors to support engagement and performance.
Includes grading and sequencing to support purposeful components that enhance client performance.

The goal is to achieve a better fit among person, task, and environment without fundamentally changing any one of them.
Sometimes alterations appear subtle or invisible but involve maneuvering the person, environment, and task to improve fit.
Requires strong activity analysis and environmental assessment to identify how to alter components to improve fit.
Example: energy conservation strategies to optimize performance of tasks within a given environment.

Proactive approach to avoid future occupational challenges.
Based on understanding disease states or situational risks to prevent negative outcomes.
Examples:
- Preventing falls by addressing balance issues.
- Preventing problematic parent skills development due to child’s difficulties.
- Preventing pressure ulcers by ensuring proper seating and positioning.
The aim is to avoid problems before they arise.

Focuses on designing and promoting performance opportunities, not on solving an existing problem.
Involves creating a space, moment, or scenario that enables improved occupational engagement.
Examples:
- Creating focused scenarios for a child to practice attention or focus.
- Creating a role-playing or social interaction environment for someone from diverse backgrounds to enhance social participation.
The goal is to promote opportunities for good occupational engagement rather than reacting to a current problem.

The five interventions can be used in full or in combination, offering a flexible yet focused approach to intervention planning.
EHP provides a streamlined framework that enhances documentation and helps families understand the OT role and the specific interventions.
The model supports client engagement in planning their interventions by explaining the five strategies clearly.
It emphasizes addressing not only physical environmental modifications but also social, cultural, and temporal environmental factors.
A strong emphasis on activity analysis and environmental assessment is required to implement the interventions effectively.
In practice, EHP is applicable in multidisciplinary settings and clinics; documenting and communicating about the intervention plan is facilitated by the consistent framework.

EHP aligns with foundational OT principles that occupation is influenced by person, environment, and occupation (task) and that performance emerges from their interaction.
It reinforces the idea that environmental modification can be as important as remediation of the person’s abilities.
The temporal environment concept integrates lifespan development and timing into intervention planning, linking theory to real-world, time-bound occupational goals.
The use of task terminology supports communication across disciplines and enhances collaborative care.

Similarities: all emphasize person–environment–occupation interactions and the ecological context of performance.
Key differences in EHP:
- Emphasis on the temporal environment and its interaction with task performance.
- The use of the term "task" instead of "occupation" to promote cross-disciplinary understanding.
- A clearly defined five-intervention framework (establish/restore, adapt/modify, alter, prevent, create) that guides planning and documentation.
These differences support a more practical and multidisciplinary approach to intervention planning and documentation.

EHP integrates the person, task, and environment within a temporal context to understand and enhance occupational performance.
It introduces five targeted intervention strategies (establish/restore, adapt/modify, alter, prevent, create) that can be used alone or in combination.
The model emphasizes a broader view of environments (including social, cultural, and temporal factors) and promotes a task-focused language to support interdisciplinary collaboration.
It aims to facilitate better client engagement, empower families in planning, and provide a robust framework for documentation and practice in occupational therapy.