Evaluation is an essential component in the program development cycle. In this paper, program also refers to curriculum. Evaluation can be conducted in a formative manner or summative after the implementation of the program. The purpose of formative evaluation is to provide on-going feedback to the program owner for check and balance at the different stages of the program development to enable continuous improvement of the program. Evaluation in this case is not a one-off process but a continuous process, it need to be built-in the program development cycle. Summative evaluation looks at the outcome of the program and this outcome will inform program owner and policy maker the worthiness of continuing the program or making amendment to it. Stake’s Congruence and Contingency Curriculum Evaluation Model and Stufflebeam Context, Input, Process and Product (CIPP) are two evaluation models that are used in program evaluation that emphasise on both process and product and are useful for both formative and summative program evaluation. This paper delves into the process of curriculum evaluation using the above methodologies based on some Malaysian examples. It also discusses on lessons learnt, challenges and related issues. One of the challenges faced in program evaluation in many countries is that after causing the initial stir and emotional upheaval(If there is), outcome of evaluation are often not followed up and suffer a premature death. The purpose of program evaluation is then not fulfilled. A new program may then being developed and history will repeat by itself. Another issue is related to the evaluation design, influencing the findings and conclusion that can be made. The kind and ways instruments used by the researcher will determine the outcome and validity of study. Often, we obtain findings that is anticipated, touching on the surface and does not produce the impact that is aspired by the researcher and policy maker. It is thus important for researcher and policy makers to scrutinise the research design to produce the most impact for the study