Classless Skills & Powers
Ability Score Generation
Roll up ability scores as usual using any of the methods in the Skills & Powers handbook (pp.12-21). Use subability scores, or not, as you desire. Since there are no classes, any character may have exceptional strength. Only roll percentile for strength if the primary strength score is 18. Split subability scores can not exceed 18 unless the primary score is itself 18 or better.
Optionally, you can provide for character ability growth if using methods V, VI, VII, VIII, IX, or X. You have the player hold back some ability score points that are then applied as the character goes up in level later in play. The exact mechanic differs by generation method, but the DM should target about 9 "growth points" such that the character reaches his or her full potential around name level.
Method V (4d6 drop lowest):
Method VI (All scores start at 8 and 7d6 points are divided between them):
Method VII (75 points, divide as you want):
Method VIII (24d6, assign as desired):
Method IX (2d6 on the chart for number of points):
Method X (75 points):
Note that in Method V the scores that can grow during play are predetermined, but are not in methods VI-X. If you want all these methods to generate predetermined maximum scores, you can have the player pre-assign his growth points to get a set of maximum values just as in Method V.
These optional "growth methods" allow characters to begin as young, slightly above average people, and grow into their full power as they advance. This avoids making starting characters into ultra-powerful 16 year olds, while allowing players to customize the character according to their unique experiences and needs as the campaign progresses.