A manager is asked to manage a major organizational change with little advance planning time. The manager decides to search for a simple and streamlined model to help manage this change. Which change management model would be appropriate for this manager to use?

The Lisco Change Roadmap is a more comprehensive approach that typically requires extensive planning and stakeholder engagement. It may not be suitable for immediate implementation due to its complexity and the detailed steps involved, which could overwhelm a manager with little advance time.

While Kotter's model is effective for guiding organizational change, it consists of eight steps that require substantial time and effort to execute properly. This model is better suited for long-term change initiatives rather than situations where a manager needs to act swiftly without extensive planning.

Diffusion of Innovation Theory focuses on how new ideas and technologies spread within a social system, emphasizing the rate of adoption among different groups. Though valuable, it does not provide a structured process for managing change in organizations and is less practical for a manager needing a straightforward model for immediate application.