PSP training follows an evolutionary improvement approach: an engineer learning to integrate the PSP into his or heyrher process begins at the first level – PSP0 – and progresses in process maturity to the final level – PSP2.1. Each Level has detailed scripts, checklists and templates to guide the engineer through required steps and helps the engineer improve her own personal software process. Humphrey encourages proficient engineers to customise these scripts and templates as they gain an understanding of their own strengths and weaknesses.
