This document discusses St. Lucia's measurement of its informal sector and informal employment. It begins with background on the project's objectives to improve data on the informal sector. It then details St. Lucia's implementation of the project, including using a 1-2 survey methodology combining a labour force survey and informal sector enterprise survey. It describes the sampling methodology used and process for editing and checking questionnaires. The document concludes by presenting some preliminary results on characteristics of informal enterprises and estimates of the informal sector's contribution to employment and GDP.