Some items to consider are:
- Define your tasks using non-technical language, and include descriptions or notes detailing the work involved
- Create milestones in your schedule to help track progress and use them as quality gates
- Ensure you have agreement with the line managers about the skill sets required of his or her resources
- Define up front how you will measure performance
- Define up front how you will measure quality
- Ensure you have a strong project sponsor that is engaged and supportive
- Use Communication plans to keep everyone informed
Doing the above (and lots of other things) will help ensure that everyone involved with the project will better understand their roles and have a vision of what the end product or service will look like.