This document summarizes a presentation given by Lior Barak on engagement KPIs and promotions at Zalando. It discusses how Zalando has grown to operate in 15 countries with over 19 million active customers and 3 billion euros in net sales in 2015. It also discusses how marketing, finance, and product teams can better align by focusing not just on orders but also user engagement through metrics like WAUs, sessions, and quality indexes. The presentation provides recommendations for setting KPIs including defining clear goals and understanding how data sources are structured.