Final answer:
Creating a supportive environment is the most effective action for the successful implementation of a planned change, as it fosters commitment from individuals and promotes an inclusive culture, thus driving the change forward.
Step-by-step explanation:
The question asks which action will have the greatest impact on the successful implementation of a planned change. Creating a supportive environment for those undergoing the change is considered to be the most effective action. This approach fosters a positive atmosphere that not only encourages the individuals who are supportive of the change but also addresses the concerns of the resisters in a non-confrontational way. By creating a supportive environment, change leaders can facilitate commitment and foster an inclusive culture that can drive the change forward.
Different strategies may influence the successful implementation differently. For example, disciplining resisters or solely rewarding supporters might create division or animosity, potentially leading to a toxic culture. Conversely, ensuring no remaining pockets of dissent and creating a supportive environment promotes unity and collective effort, crucial for institutionalizing change.
Ultimately, sustainable change requires the support and involvement of people across the organization. Building trust, leading by example, and harnessing the power of communication and positive reinforcement are key to shifting behaviors and attitudes for long-term success.