Experimental research design is one of the most systematic and scientific approaches used in social work research to establish cause-and-effect relationships between variables. It enables researchers to determine whether a particular intervention, programme, policy, or treatment produces the desired outcomes among individuals, groups, or communities. Since social work is a practice-oriented profession that seeks to improve the well-being of people, experimental research provides reliable evidence to evaluate the effectiveness of various social work interventions. The defining feature of experimental research design is the manipulation of an independent variable while controlling other factors that may influence the dependent variable. Participants are generally divided into an experimental group, which receives the intervention, and a control group, which does not receive it or receives a standard intervention. Random assignment of participants to these groups helps reduce bias and ensures that differences in outcomes are due to the intervention rather than external factors. One of the greatest importance of experimental research design in social work is its ability to establish causal relationships. Unlike descriptive or correlational studies, experimental research can demonstrate whether a specific social work programme directly causes positive changes in the lives of clients. This is particularly useful in evaluating counselling methods, rehabilitation programmes, child welfare services, educational interventions, mental health treatments, and community development projects. Experimental research contributes significantly to evidence-based social work practice. Modern social work emphasizes the use of scientifically validated methods rather than relying solely on personal experience or intuition. Findings obtained through experimental research provide empirical evidence regarding which interventions are most effective. This