Research design is the overall plan or blueprint that guides the entire research process. It helps the researcher collect, analyze, and interpret data in a systematic and scientific manner. In counseling and family therapy, a well-planned research design ensures that findings are reliable, valid, ethical, and useful for improving therapeutic interventions, counseling techniques, and family-based treatment programs. The principles of research design provide a framework for conducting meaningful and trustworthy research. The first principle is clarity of the research problem. Every research study should begin with a clearly defined problem or question. The objectives must be specific and focused so that the researcher knows exactly what needs to be studied. In counseling research, the problem may involve evaluating the effectiveness of a counseling approach, understanding family dynamics, or studying mental health outcomes. Another important principle is the formulation of clear objectives and hypotheses. Research objectives describe what the study intends to achieve, while hypotheses provide tentative answers that can be tested scientifically. Clearly stated objectives help in selecting suitable methods of data collection and analysis. Objectivity is a fundamental principle of research design. The researcher should avoid personal opinions, beliefs, or biases while collecting and interpreting data. Standardized procedures, validated instruments, and unbiased observation improve the credibility of research findings. In family therapy research, objectivity is essential because emotional and interpersonal issues may influence both participants and researchers. Validity is another key principle. A research design should ensure that the study measures what it is intended to measure. Internal validity refers to the accuracy of conclusions about cause-and-effect relationships, while external validity relates to the ability to generalize findings to