Apprenticeship is the main avenue to self-employment in micro-enterprises and thus a cornerstone of informal sector development in West Africa. Survey results for Ibadan, Lome, Dakar, Niamey, and other cities demonstrate that apprenticeship as practiced by informal sector artisans is often very similar from one country to the next. Dropout rates are estimated at 20-25%. Micro-enterprises involved in apprenticeable trades produce, on average, one "graduate" per year. Apprenticeship is not only for young men. Females apprentice in female-dominated trades. Survey data confirm that apprentices tend to be better educated than their masters. A majority select their trade because it was something they had always wanted to do. Masters are often selected because they are relatives or family acquaintances. Costs of apprenticeship vary considerably among and within trades and from one country to another depending on demand and whether the master is a relative. Apprenticeship usually takes 3 or 4 years, and working hours are long. Apprentices learn primarily by watching their master and being "corrected" when they err. Usually, masters follow a training plan. Apprentices learn technical skills as well as management and organization skills. Three of four apprentices state they want to create their own establishment; many seek wage employment at first. Intervention options should include measures aimed at apprentices or at masters. (Appendixes include 10 statistical tables.) (YLB)