Navigating the complexities of impact assessment and evaluation can be challenging in the development sector, where terms like Monitoring and Evaluation (M&E), and Impact Assessment are often used interchangeably. This guidebook serves as a practical resource to clarify these concepts, offering a clear understanding of their distinctions and applications. Tailored for our target audience, the guidebook equips organisations with the knowledge and tools needed for effective decision-making and resource allocation needed for impact assessment. Whether you're looking to refine your impact strategy or enhance your evaluation processes, this resource is designed to support your journey towards more informed and impactful development work.