My current project is suffering from too little planing on the front end, which is making it expensive on the back end.
I am amazed at how often this happens.
The cheapest part of the project is the planning phase. It involves a limited number of people and hardly any materials, so the cash costs are few, yet most projects spend too little time in this phase. For some reason it doesn't feel like real work, or something that is to be endured rather than as a crucible to refine the project before the first egg is broken.
You wouldn't begin building a house without first knowing exactly what each room is going to look like, yet jobs routinely begin with at only a napkin sketch of the finished product. While this can be successful, the odds of big cash costs and emotional trauma are large.
In short, I'm not sure I have ever worked on a project that was over-planned. I definitely willing to find out.