The evaluation literature often debates whether evaluators should be flexib
le in evaluation design and activities in order to collaborate with program
directors and be responsive to programming needs. Two conditions are speci
fied under which evaluation flexibility is not only desirable but essential
. Two examples from the cluster evaluation of the W. K. Kellogg Foundation'
s Community Partnerships for Health Professions Education initiative are pr
ovided to illustrate why flexibility under these conditions proved to be es
sential. One of the examples, related to the "community" involvement in the
initiative, illustrates the need for flexibility as programs experience go
als clarification. The other example, related to the coincidental national
health care reform efforts, illustrates the need for flexibility both to ca
pture programs' efforts to protect their integrity and to ensure against sp
urious conclusions as a result of external turbulence in policy environment
s. How the cluster evaluation ream addressed these issues is also described
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