The Occupational Therapy Intervention Process Model is a model that guides therapists to use top-down, client-centered, and occupational-based approaches to assessment and intervention. In this model, assessment begins with an initial referral or a chart review. Therapists then meet and have an interview with clients in order to build the client-centered performance context and to gather relevant information and identify the clients’ goals. Next, a top-down approach is used to evaluate the situation with considerations of the clients’ diagnosed conditions. Therapeutic rapport also begins to establish and maintain a comfortable and unconstrained relationship of mutual confidence and respect between the therapists and clients. Identifying strengths and problems of the clients is the further step for the therapists to implement the clients’ performance analyses. This evaluates the demands of a task and the skills of the person by using standardized performance analysis, such as the Assessment of Motor and Process Skills. After the performance analysis is obtained, the therapists can identify the actions that the clients do not perform well and clarify the possible cause, such as physical environments, social environments or societal constraints. Based on the performance analysis result, the therapists choose suitable intervention approaches or plan adaptive strategies in order to compensate the clients’ ineffective actions. Re-evaluating activity performance, refining actions, and selecting suitable approaches to remediate impairments will be implemented by the therapists in order to facilitate the achievement of the clients’ goals.