This document analyzes national household surveys in South Africa to measure employment in the informal sector. It discusses problems in accurately capturing informal sector work, including respondents not viewing low-paying or illegal activities as "work" and surveys only capturing main jobs. The document examines how five surveys from 1993 to 2000 addressed these issues, finding improvements over time but ongoing sources of underestimation. Estimates of informal employment increased substantially, but it is unclear how much reflects better data versus real growth.