The following are parts of an instructional system, except:

The correct answer is that program design is not typically considered a part of the instructional system as outlined in this context. An instructional system generally revolves around a cyclical process that involves several key components: diagnosing problems, delivering the program, and evaluating its success and effectiveness.

Problem diagnosis refers to identifying what learners need or what gaps exist that require instructional intervention. This is critical to ensure that the subsequent phases are relevant and targeted towards addressing those specific needs.

Program delivery entails the actual implementation of the instructional program, where the planned learning experiences are executed to the learners. This is where the strategies, materials, and resources come into play to facilitate learning.

Program evaluation is the process through which the effectiveness and impact of the instruction are measured. It determines whether the learning objectives have been met and provides insights for improvements in future iterations of the program.

In contrast, program design, while important and initially necessary, is more of a preliminary phase that precedes the implementation and evaluation stages in the instructional process. It sets the groundwork for how the program will be structured and delivered, but it is not part of the ongoing instructional system cycle that focuses on improvement and responsiveness to learner needs.