One of the key areas to consider when one decides to conduct a language program evaluation is to select an evaluation design. Based on the work of leading experts, there are generally three broad categories of evaluation designs. The first one is called the positivist evaluation design, where phenomena are measured and supported by objective evidence. Being closely linked to the “quantitative dimension” it is usually summative in nature or product oriented. It is also usually a terminal evaluation of a program that is already operational. Generally, there are two types of positivist designs; the true experimental design and the program group only designs. The second category is the interpretivism evaluation design, where evaluators respond to program participants and processes which are observed over time. As such, the interpretivism approach relies on the subjective association between the researcher and the subjects as well as the processes. The interpretevist approach is very much qualitative and process-oriented in nature. The third category is the mixed evaluation design, where the design draws upon elements from both the positivist and interpretevist paradigms. Therefore, it capitalises on and combines features from the summative and formative dimensions, as well as from the product and process dimensions. Finally, whichever design is selected, one needs to be wary of the design weakening factors.