The video explains the concept of Organizational Diagnosis, which involves identifying gaps between an organization's current and desired performance, and implementing changes to reach its goals. The process involves entering publicly into the human system, collecting valid data, and giving feedback to promote performance. Two models of diagnosing organizations are explained: the closed system and the open system. The former ignores external environmental change and hinders growth and learning, while the latter views all components within an organization as interrelated and adaptable to external changes. Techniques for organizational diagnosis include questionnaires, interviews, observations, analysis, workshops, and examination of critical incidents. Organizational development consultants have developed a range of interventions to promote change and development, such as training, placement programs, stress management, feedback, and survey data. Overall, the diagnostic organizational process is useful in adapting and changing an organization's culture by identifying weaknesses and strengths that need to be corrected or increased.