Estimate Before, During, and After the Software Project By Larry Putnam Jr (October 15, 2014) Feasibility studies, continuous forecasts, and creating benchmarks are three basic rules to help you and your PMO get the most out of estimating efforts.
All In: Collaborative Software Estimates By Laura Zuber (September 11, 2013) Tracking metrics from completed projects, and creating transparent estimation processes, will save your team a lot of pain and resources by avoiding disasters in risky projects.