It cannot be emphasized enough that good instructional development incorporates
evaluation throughout the process, not just at the end. This is reflected
in the model by incorporating explicit evaluation and revision activities
as part of several steps. After the design step, evaluation includes review
and discussion by the content experts, instructional designers, and clients.
Revision may require reassessment of goals, collecting more resources,
learning more about the content. generating more ideas, correcting task
analyses, changing the methodology, and so on. After revision the
evaluation should be repeated. Evaluation and revision form a cycle
which progresses until all concerned parties are agreed that the quality
is sufficient to progress to the next step.
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