Wieferich have changed the credits per task and it has upset some crunchers eg Team Norway, and I agree with them.

The classification - MARCH 2008:
Complete test:
Number of points (actual version of client) 16
Periodic test:
Number of points (actual version of client) 24

The classification - NOW (26 Nov 2008):
Complete test:
Number of points (actual version of client) 10
Periodic test:
Number of points (actual version of client) 34

Complete test has a constant complexity (approximately), but we have more powerful computers in the project now! (big irons...?) Periodic test has an increasing complexity.