The AATT Project was directed, at the Non-Advocate Review (NAR), to not maintain a reserve, which significantly hampered the project's ability to mitigate risk and address unforeseen situations. Most schools-of-thought recognize the importance of any project manager maintaining a reasonable reserve for purposes of risk management and mitigation. Having no other option but to re/de-scope in some fashion obviously has negative effects on the project and its ability to deliver completely and on time.
Related Topics
Risk Management for Quality Assurance