Difference of Territory in "Incentive Compensation" and "Territory Management" modules

Hi Guys,

I'm now engaging in a project in which sales related process are needed including sales planning and performance management. We need to manage the territory and the sales organization, manage the sales quota for the sales team, and measure the sales performance.

In Siebel bookshelf, i found there're 2 modules related to territory: "Incentive Compensation" and "Territory management". The qeustion is that:

1. Which one in the two modules is the siebel product development direction? i.e. which module is still alive and under further development in siebel?  I saw that the "Incentive Compensation Administration guide" disappeared from the 8.1 bookshelf. Does that mean "Incentive Compensentation" module abandoned from further development?