Instead of "linear", perhaps we should be saying "mathematical". We are still dealing with the aspect that higher numbers are more favorable than the lower numbers that preceded them. However, instead of an arithmetic progression -- 1 + 1 + 1 + 1 etc. = 1, 2, 3, 4, etc. -- it may be an geometric progression -- 1, 2, 4, 8, 16, etc. -- or perhaps even exponential -- 1 x 1 (1), 2 x 2 (4), 3 x 3 (9), 4 x 4 (16), etc. Geometric and exponential would fit well with the Law of Diminishing Returns. The problem with the system is that it doesn't say what kind of progression is being used. That leaves the players in the dark, not knowing how the mechanics work -- and leaving us to have unresolvable debates such as this. _How_ the progression works is, imo, vital information, so that the player can make reasonable decisions as to whether to throw a 5th Skill Point at Skill X, or whether doing so will be a waste until such time as another 4 more points get applied to that Skill.
@ Marvel Super Heroes, the reason there is _always_ a 5% chance of failure is because the system is using a 1D20 die roll to determine success or failure -- and rolling a 1 is _always_ "failure". The outcomes for die rolls of 2-20 keep on improving as the character advances. So comparing chance of failure between wimp and demi-god renders the wrong interpretation. Instead compare the success outcomes to get a real grasp of how much more powerful the demi-god is.
@ D&D and the parenthetic numbers after the 18: IF a player rolled an 18 Strength, he then rolled a 1D100. [Actually, it was with two D20s. Both were numbered 0-9 twice. One die represented the tens digit and the other the ones digit. The results yielded a arithatic progression from 01 to (1)00.] Having demonstrated that the character was outstanding, the question was "Just how much more outstanding was he?" But keep in mind that whatever that gradation would be, a STR of 19 was still better. And a 20 would be better still. I don't recall precisely, but I seem to remember that the 100% was broken down into breaking point tiers so that getting significant improvements required that the player rolled 90 or higher. (And then disappointed when a Book of Lore gave him +1 STR and rendered that high percentile die roll meaningless.)
