This text investigates the foundational methodologies required to conduct rigorous empirical research within the fields of criminal justice and criminology. Frank E. Hagan, a recognized scholar in the discipline, synthesizes complex statistical and qualitative frameworks into a pedagogical structure suitable for both undergraduate and graduate students. The book argues that a comprehensive understanding of research design, data collection, and ethical analysis is essential for evaluating contemporary criminal justice policies and practices.

This work is widely regarded as a standard academic resource for students and practitioners seeking a structured introduction to criminological inquiry. Its consistent use of field-specific examples provides a clear, accessible entry point into complex methodological concepts.