1. Stage-gates are often designed as threshold barriers (i.e., "must-meet" requirements) where projects are allowed to go through only if they meet a specific number of criteria. These criteria could be factors such as minimum market-size addressed, maximum resource requirement etc.

Many projects have to deal with uncertainty where the criteria that are achievable is unclear at the beginning. Given this uncertainty, should the thresholds/criteria at the stage-gates (decision-points) be up for re-negotiation after it has been decided once? What are the pros and cons for "flexible" vs "hard and fast" criteria?