Introduction :
Evaluation is the process of collecting data on a programme to determine its value or worth with the aim of deciding whether to adopt, reject, or revise the programme. Programmes are evaluated to answer questions and concerns of various parties. The public want to know whether the curriculum implemented has achieved its aims and objectives; teachers want to know whether what they are doing in the classroom is effective; and the developer or planner wants to know how to improve the curriculum product.
Definitions :
• Ornstein and Hunkins (1998) define curriculum evaluation as “a process or cluster of processes that people perform in order to gather data that will enable them to decide whether to accept, change, or eliminate something- the curriculum in general or an educational textbook in particular” (p.320).
• Worthen and Sanders (1987) define curriculum evaluation as “the formal determination of the quality, effectiveness, or value of a programme, product, project, process, objective, or curriculum” (p.22-23).
• Gay (1985) argues that the aim of curriculum evaluation is to identify its weaknesses and strengths as well as problems encountered in implementation; to improve the curriculum development process; to determine the effectiveness of the curriculum and the returns on finance allocated.
• Oliva (1988) defined curriculum evaluation as the process of delineating, obtaining, and providing useful information for judging decision alternatives. The primary decision alternatives to consider based upon the evaluation results are: to maintain the curriculum as is; to modify the curriculum; or to eliminate the curriculum.
Curriculum Evaluation Models
Several experts have proposed different models describing how and what should be involved in evaluating a curriculum. Models are