In this chapter we focus on evaluation in the context of integrated care practice. Well-structured and rigorous evaluation of integrated care policy and practice contributes to our evidence and knowledge about what works in different contexts. Integrated care can be challenging to evaluate and this chapter explores why this is. It presents the types of evaluation we see commonly in integrated care and different methodologies that can be employed in design and execution by program teams in collaboration with independent research teams or embedded within the program. The steps that evaluators need to take to address these challenges and ensure that evaluation results are reliable in context and potentially generalizable to other contexts are also explored.