Implementation analyses conducted as part of impact studies can help educators know whether a tested intervention is likely to be a good fit for their own settings. This guide can help researchers design and conduct these kinds of analyses. The guide provides steps and recommendations about ways to specify implementation research questions, assess whether and how the planned intervention is implemented, document the context in which the intervention is implemented, and measure the difference between the intervention and what members of the control group receive. It presents strategies for analysis and reporting about these topics, and also for linking implementation and impact findings. The guide offers key definitions, examples, templates, and links to resources.