What are the techniques used in improv?

I am assuming that you a refering to improvisational comedy rather than music or other areas. Since this is not my area of expertise, I searched Google under the key words "improv techniques" to get these possible sources:

http://greenlightwiki.com/improv/%22Always_Funny%22_Stuff_that_Doesn't_Work_in_Improv
http://en.wikipedia.org/wiki/Improvisational_theatre
http://www.humanpingpongball.com/

I hope this helps. Thanks for asking.

wat the hell?? this doesnt help me 1 bit!! ive got a speech on lecoq and boal due 2moro and its sooooo hard!!!

Tension created in Woman in Black(play) by Stephan Mallartt.