You can always tell a human factors person, but you can’t tell them much. 
The guys over at Humanized provide some food for thought about designing usability into Open Source applications. My favorite suggestion was the first one:
Get a Benevolent Dictator
Someone who has a vision for the UI. Someone who can and will say “no” to features that don’t fit the vision.
If there isn’t someone on the team whose job it is to say “no,” you’ll say “yes” to everything, and you’ll wind up with bloatware. Having a plug-in architecture (suggestion 4) is the compromise that makes this suggestion workable.
