[Air-l] internet surveying question

I am designing a survey that will be implemented in June with users of telecenters in Brazil that will attempt to rate the skill level or maybe the degree of sophistication of the internet user. Does anyone know of any existing surveys or literature that I might be able to explore? Thanks, Jeremiah Spence PhD Student Department of Radio, Television & Film Population Research Center University of Texas at Austin jspence5@mail.utexas.edu