Could someone point me to the section of the rules that shows why anyone would want to use the instruction skill? I've found rules that say that the instructor can grant bonus dice to the person learning the skill - which should make them able to learn it faster... but in the section about spending karma to raise skills, it just abstracts that away and says you can only learn one new skill between missions, or can raise as many skills as you like, but only by one.

Oh I'm surprise you missed the they are on page (loud coughing noise.) In the just released (Loud coughing noise).

I hope that helps.

They don't appear to be anywhere.
Enjoy the fluff

On page 172 my SR4 book describes how having an instructor with the Instruction skill can reduce the number of days it takes to learn a new spell.

If it has any effects on normal skills I have yet to find out what, but for learing spells a good instructor can help.

Possibly advanced training rules will be part of a later sourcebook.

Due to streamlining all rules should have been in the BBB.

or you could have a set house rule, that if one of the pc's has instruction and a skill another pc wants to learn, lessen the karma appropratly, or if its a more rare skill (pilot Aerospace for example) have it where they can only learn from someone with the instruct skill.

We should have a dedicated "House Rules that Shoulda Been in the Core Book" section.

I have a house rule I'm playtesting a bit.