Alistar Cockburn describes in this post the success of a methodology with the formula:
Methodology Success = Project delivered + Staff would do it again
In software projects people is a fundamental variable, so here with methodology is not intended say RUP or FDD or say XP or Scrum or Kanban. Instead is intended that
A methodology is the conventions the team agrees to and actually follow
When the team achieves a methodology success as defined above, it is possible to infer that the team and also the method they used, RUP or FDD or one of the others, helped the project success.
In case...