Final answer:
The State Technical Institute's Leisure Assessment Process (STILAP) is used to assess social skills in clients with developmental disabilities, particularly in relation to leisure activities.
Step-by-step explanation:
The functional skills assessment used to determine the social skills of clients with developmental disabilities is D. State Technical Institute's Leisure Assessment Process (STILAP). This assessment tool is designed to provide comprehensive information about an individual's leisure skills, preferences, and barriers to leisure participation.
It can be used to create personalized intervention plans to enhance leisure experiences and social engagement for those with developmental disabilities. Other methodologies, such as applied behavior analysis (ABA), social communication groups, and social skills groups, also contribute to the assessment and improvement of social skills.
However, for the specific aspect of leisure and recreational functioning, tools like STILAP are more focused and tailored. This contrasts with general adult functional literacy and numeracy skills assessors such as the OECD's Programme for International Assessment of Adult Competencies (PIAAC), which measures the general skill levels of adults in literacy, numeracy, and problem-solving in technology-rich environments.
Although STILAP is the specific answer to the student's query, it's important to utilize a comprehensive approach when supporting clients with developmental disabilities, considering multiple assessments and interventions to ensure well-rounded support and guidance.