The document discusses the concept of diversity within the context of RENDER, which deals with modeling communication and usage of documents. It identifies several types of diversity that could be relevant to RENDER, including diversity in topics, knowledge, languages, opinions, geographies, and contexts represented in content and usage data. Diversity in content may come from differences in topics covered, social relationships depicted, languages used, opinions expressed, and reporting biases. Diversity in usage can come from variations in user demographics, interests, locations, access methods, social networks, access times, and historical usage patterns. The document aims to structure the notion of diversity within RENDER scenarios involving content producers, content users, and their data.