Which assessment type involves collecting qualitative and quantitative data about existing behaviors?

The assessment type that involves collecting both qualitative and quantitative data about existing behaviors is descriptive assessment. This method focuses on obtaining a comprehensive understanding of the behaviors being observed by using various techniques such as direct observation and interviews. Through descriptive assessments, practitioners can gather detailed information about the context of the behaviors, frequency, and specific circumstances surrounding them.

This approach allows professionals to identify patterns and triggers that may influence the behaviors, which is essential for developing effective intervention strategies. By combining qualitative observations with quantitative measures, descriptive assessments provide a well-rounded view of the behavior in question, making it a fundamental tool in special education and behavioral analysis.