[Fifteen ways to optimize feedback.]

: This article proposes a series of insights that are drawn from the most up-to-date scientific literature and functional for an optimal implementation of Audit & Feedback (A&F). The focus is on the "feedback" component of the methodology. Some key issues of the feedback are the capability to address changes perceived as priorities for the recipients, recommend actions that bring real improvements, and allow the people to whom recommendations are addressed to manage them. Other suggestions concern how to share the data: it is important to provide feedback as soon as possible, multiple times, starting from individual rather than general data, and including comparisons able to promote the desired change. Other operational indications concern the most effective way to display the feedback, such as tightly linking the graphical representation and the summary message, presenting the feedback in multiple ways, and simplifying the message to minimize cognitive overload. Finally, some suggestions are about how to transmit feedback: tailor interventions according to the specific barriers of a given clinical-organizational context, provide short and easily understandable messages followed by more details, emphasize the credibility of information, increase motivation to change practice, and encourage participatory feedback construction rather than passive delivery. It also proposes an analysis of some of the challenges related to the design of A&F interventions translatable into improvements in practice starting from the context of the Easy-Net network program.