Faced with increasing demands for accountability, teachers are having to base their instructional decisions and choice of interventions on data on student performance. This book shows how to make this otherwise daunting task much more manageable by means of case studies and countless evidencebased forms and graphs. Although this book often refers to students and classrooms, the data collection techniques are applicable to a wide range of environments, including clinics, job-training and actual job sites, and homes. In addition, the data collection tools and procedures are relevant for use with a wide range of ages, from toddlers to adults.