NASA faced challenges of retaining knowledge as experienced scientists and engineers retired. Downsizing led to an imbalance in skills as junior employees took on senior roles. There was no formal process for transferring knowledge from departing employees. Two options considered were increasing IT infrastructure to capture and share knowledge, or reforming the culture to encourage knowledge sharing through mentoring and incentives. NASA initiated several knowledge management programs, including improving documentation, an academy for leadership development, and a web portal to capture design knowledge. However, changing culture to overcome resistance to sharing negative lessons proved difficult.