Transition countries, such as the Republic of Moldova, have experienced a growth in the informal sector, which has become an essential part of the economy. It's important because it creates jobs, provides incomes to the population, and produces goods and services. There has also been an increase in informal employment, meaning it has become urgent to collect appropriate data on these sectors. Once data is collected, it can be analyzed to know its contribution to the Gross Domestic Product, how it affects specific groups employed in this sector, and what planning state support and assistance policies can be formulated to achieve workers' protection and decent work for all. Surveys were made in 2003 for the Republic of Moldova, and the paper analyzes them and makes suggestions on how to improve the surveys to give them more precision for the following year.