The number of schools that have access to computers and the Internet has increased rapidly since the beginning of the 1990s. However, evidence of their effectiveness as pedagogical tools to acquire reading and math skills is still the object of debate. We use repeated cross-section data from Brazil to evaluate the effect of the availability of a computer lab and the use of computers and the Internet by teachers on pupils' math and reading test scores at age 15. (Contains 5 tables, 1 figure and 9 notes.)