Ranking APEX is coupled with the level of applications experience of the project team developing the software system or subsystem. The ratings in the following table are characterized in terms of the project team’s equivalent level of experience with this kind of software system
| APEX Descriptors | <= 2 months | 6 months | 1 year | 3 years | 6 years | |
|---|---|---|---|---|---|---|
| Rating Levels | Very Low | Low | Nominal | High | Very High | Extra High |
| Value | 1.22 | 1.10 | 1.00 | 0.88 | 0.81 | n/a |