This paper attempts to lay a general framework for analyzing credibility gaps in evaluative information at various levels of organizational structure. The CIPP model is chosen as a point of reference in order to identify the type of evaluative information to which the concern of this paper is addressed. Credibility gaps are classified as personnel related and organization related. The latter, an Organizational Credibility Gap, exists at each organizational level where the same person is both accountable for a program's success or failure and responsible for the formal evaluation of that program. Three characteristics of such gaps are: (1) They are basically a "conflict of interests" relationship between the organizational roles; (2) They are separate from personalities as such; and (3) The essence of these gaps is that of potential incredulity. Four propositions which may serve as guidelines in the institutionalization of evaluation functions in educational institutions are: (1) Gaps can be delineated in a project's planning stages; (2) Gaps should be minimized; (3) The bridging of each gap should be planned; and (4) The strategy of internal evaluation with external audit provides the balanced use of resources for a long-range development and institutionalization of evaluation functions in educational institutions. A combination of the propositions supports an overall strategy that would support the long-range buildup of in house evaluation capabilities of educational institutions. (CK)