This document discusses the information needs of knowledge workers and challenges in meeting those needs. It notes that knowledge workers spend 15-35% of their time searching for information, but are only successful 50% of the time. This results in lost productivity of 20-25%. It also discusses challenges like complicated access controls and understanding results from past similar cases. Opportunities mentioned include understanding information needs in a given domain and extracting relevant entities to drive semantic search tailored to the context of the case being worked on.