Answer :
The general diagnostic model that most underlies OD is open-systems model.
A diagnostic model is a framework for identifying, analyzing and interpreting data in a given context to identify possible needs. The key here is “business diagnostic” Any diagnostic that only looks at people, style and people process and ignores business processes, marketing and finance is not a business diagnostic. The Group level gives the practitioner a closer look at what the culture is, how communication flows, and how well each component is aligned with the overarching design of the organization. The outputs examined in this case are team effectiveness, quality of work life, and performance. External OD consultants do not generally differ in experience, education, or training from internal OD practitioners.
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