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An experimental design is the process of planning and organizing scientific experiments to obtain useful results from collected data. Experimental design is an important aspect of the scientific method because it ensures the validity and reliability of the information extracted from available data. In several experimental designs, objects or participants are randomly assigned to an experimental group to avoid any type of bias; these are called true experiments.<\/span>\u00a0<\/span><\/p>\n A <\/span>quasi-experimental design<\/span> is a study design in which participants cannot be randomly assigned to an experimental or control group for practical or ethical reasons. However, like a true experiment, it is used to evaluate the effects of an intervention, or in other words, to establish a cause-and effect relationship between independent and dependent variables. The intervention could be a training program, a policy change, a medical treatment, etc. In such <\/span>quasi-experimental designs<\/span>, the assignment of participants is usually based on self-selection or selection by an administrator or researcher.\u00a0<\/span>\u00a0<\/span><\/p>\n This article will provide the <\/span>quasi-experimental design definition<\/span> and will describe in detail the types and uses of such experimental designs and their similarities and differences with true experiments.<\/span>\u00a0<\/span><\/p>\n