Missing Projections
Here's an interesting framework to use when considering why a group or company misses projections. I'm sure it's not perfect, but it's interesting to think about it this way.
When you've missed goal by:
50% - Blame the strategy (it's way off)
20% - Blame the manager (you have an execution problem)
5% - Blame the team (they're either not paying attention or they're not accountable)