An introduction explains the difference between basic and applied research and the types of evaluation research. Additional sections discuss the principles of a scientific perspective, research ethics, choosing a research topic, defining concepts and variables, and the choice of a research design. Further chapters focus on probability and non-probability sampling, the use of questionnaires and interviews, document research, observation, the use of physical evidence, the role of experiments, and the use of descriptive statistics. Other sections explain the examination of relationships between two or more variables through cross-tabulation, regression and correlation analysis, inferential statistics and parameter estimation, hypothesis testing, common errors in presenting and interpreting research findings, preparing and reading research reports, and the use of computers in criminal justice research. Tables, figures; chapter review questions, exercises, and reference notes; appended background information; glossary; index; and 81 readings