The Ares Projects Office (APO), located at NASA’s Marshall Space Flight Center (MSFC), was chartered to provide the new Ares I crew launch vehicle (CLV) and Ares V cargo launch vehicle (CaLV) space transportation system. The Ares management team developed an aggressive, multiyear plan and implemented a rigorous systems engineering approach in coordination with, and guided by, the Constellation Program (CxP) and the Exploration Systems Mission Directorate (ESMD). The APO actively employed knowledge management (KM) principles and functions throughout the project’s life. Team members were both active learners and knowledge contributors. The formal KM guidelines were defined in the CxP 72027, APO Knowledge Management Plan. As the project faced termination, the knowledge capture (KC) activity became urgent and resulted in the creation of this report and associated knowledge activities. The attached document is the summation of the knowledge gleaned from extensive capture of lessons learned during the period of time from 2006 until spring of 2011, regarding processes, procedures, and activities that worked well and those that did not meet the expectations or requirements.