Each bow is tested on four objective criteria, which account for 60 percent of the total score, and five subjective criteria, which account for the remaining 40 percent. The objective criteria are:
Weight
Speed when shooting a 350-gram arrow
Peak Noise
Vibration

The subjective criteria are:
Fit and Finish
Balance and Ergonomics
Solidness of back wall
Smoothness of the draw cycle
Overall Shootability

The star system you'll see is based on four stars.
****=90-100
***=80-89
**=70-79
*=60-69