"This technical report introduces a set of evidence-based principles to guide evaluation practice in contexts where evaluation knowledge is collaboratively produced by evaluators and stakeholders. The data from this study evolved in four phases: two pilot phases exploring the desirability of developing a set of principles, an online questionnaire survey that drew on the expertise of practicing evaluators to identify dimensions, factors or characteristics that enhance or impede success in collaborative approaches, and finally a validation phase. The principles introduced here stem from the experiences of 320 evaluators who have engaged in collaborative approaches in a wide variety of evaluation settings and the lessons they have learned. We expect the principles to evolve over time, as evaluators learn more about collaborative approaches in context. With this in mind, we pose questions for consideration to stimulate further inquiry." (Abstract)