Final answer:
The distinction between Dialogic OD and Diagnostic OD lies in their approaches, with Dialogic OD utilizing participatory processes and focusing on systemic perspectives, while Diagnostic OD relies on top-down, expert-driven interventions.
Step-by-step explanation:
The key difference between Dialogic Organizational Development (OD) and Diagnostic Organizational Development (OD) is related to their approaches to change and intervention within an organization. While Dialogic OD involves participatory processes that engage organizational members in dialogue to create change and focus on narratives, culture, and systemic perspectives, Diagnostic OD employs more structured and linear interventions that typically involve expert analysis and a top-down approach to address issues. Choice a) regarding group dynamics versus individual assessment does not directly differentiate the two; choice b) concerning the use of surveys versus interviews does not capture the essence of the difference; and choice d) is incorrect as both approaches are not exclusive to the size of the organization but rather to the style and purpose of the intervention. Choice c) correctly identifies the participatory nature of Dialogic OD and the top-down nature of Diagnostic OD as the key differentiating factor.