After 50 years it appears that the definitions for project management continue to include a limited set of success criteria, namely the Iron Triangle, cost, time and quality. These criteria, it is suggested, are no more than two best guesses and a phenomenon. A finite time resource is possibly the feature which differentiates project management from most other types of management. However to focus the success criteria exclusively upon the delivery criteria to the exclusion of others, it is suggested, may have produced an inaccurate picture of so called failed project management. An argument has been provided which demonstrates that two Types of errors can exist within project management. Type I errors when something is done wrong, while a Type II error is when something has not been done as well as it could have been or something was missed. It has further been argued the literature indicates other success criteria have been identified, but to date the Iron Triangle seems to continue to be the preferred success criteria. The significant point to be made is that project management may be committing a Type II error, and that error is the reluctance to include additional success criteria.