This is something else I like to do with my projects.  Much broader than system requirements, but more specific than the mission statement.  These goals also tend to me “Nice to haves”.  Their importance and relative complexity will determine if they make it in to the final product.

1. Travel 60 miles at 70 mph on a single charge
2. Charge in less than 8 hours using a specially designed charger
3. Charge in less than 16 hours using a standard 110 volt AC plug
4. Cost less than $6,500
5. Have an operational air conditioner that will still allow for travel for 45 miles at 70 mph
6. Do the entire project in metric (exception: miles will be used where necessary instead of kilometers)
7. Power Steering
8. Power Windows
9. Utilize Recouprative Braking
10. Display the relative power remaining on the dash
11. Display the distance that can be traveled at the current speed on the dash in miles

The nice thing about project goals is that I can add to them as necessary.  This will do for a start.