I know this topic hasn't been touched in quite awhile, but I think I found a mix up in the skill. This could go under Errata or Issues with SoHK.
If you subtract the # of Ranks of relevant Aware-Search Skill from the Ranks of Alertness, you imply that Alertness should always be lower than Aware-Search.
The Difficulty is based on a lower number being easier and it's not 1:1.
(2 Alert) - (1 A-S) = 1 or +1DR
(1 Alert) - (8 A-S) = 7 or +2 DR
If you can develop another skill to modify the DR of the 1st skill, should it read "Alertness subtracted from Aware-Search"?
(2 A-S) - (1 Alert) = 1 or +1DR
(8 A-S) - (10 Alert) = -2 or Same DR
The Alert skill allows the same info as A-S but uses 0%Act and at at higher +DR. So shouldn't it be the higher your Alert, the easier the Task.
I do like this skill. IMHO, FBI agents, Stephen King's Gunslingers, etc. excel at Alertness.
The way it's written, the better you are at Alert, it is more difficult to use A-S. It seems that eventually, your Alertness could be so high, that A-S would be easier..
Or I'm embarrassingly slysdexic.