how does FACEBOOK and YOUTUBE utilizie the Congruence Diagnostic Model to review aspects of change activities and actions.

Provide a comprehensive review of the change diagnostic model (Congruence Diagnostic Model) chosen that details the components included as well as some background about the model itself through research from the author(s)

Include the rationale defending why that particular model was selected. You can utilize a review of internal/external pressures that have affected the companies chosen.