METHODOLOGICAL SYNTHESIS
The third Survey on Employment and the Informal Sector (EESI3) is a two-phase statistical survey, the first of which aims to understand employment (Employment Survey) and the second to assess the economic activities of the non-agricultural informal sector (Informal Sector Survey). The first EESI-type survey was carried out in 2005 and the second in 2010. The geographical scope of this operation is the entire national territory. For the technical needs of the survey, the national territory was divided into 12 survey regions: the cities of Douala and Yaoundé, Adamawa, the Centre without Yaoundé, the East, the Far North, the Littoral without Douala, the North, the Northwest, the West, the South and the South-West. The primary sampling frame is made up of all the enumeration areas (EAs) delineated during the mapping work carried out in 2017 as part of the 4th RGPH. A total of 882 out of nearly 21,826 DAs were shot and visited. The sampling design is stratified at two stages. In the first degree, 882 ZDs were drawn to be included in the sample. In the second degree, 10,642 households were drawn in the selected ZDs. The strata were constructed by combining the 12 survey areas and the stratum of residence (urban, semi-urban, rural). A total of 32 strata were defined. To ensure data collection, three collection media were used, namely: the household file and the individual questionnaire for persons aged 10 years or older (phase 1), and the questionnaire for the informal production unit (phase 2). The Employment Survey (Phase 1) successfully surveyed 8,738 households out of the 10,060 drawn. In these households, the survey looked at all persons aged 10 years or older. The Informal Sector Survey (Phase 2) identified 4,762 non-agricultural informal production units (IPUs) and surveyed 4,576 of them, representing a coverage rate of 96.1%. These IPUs were previously identified at the level of phase 1 (Employment Survey). The two phases of the investigation took place at the same time. Field data collection took place from May 10 to July 10, 2021. Data collection was done using the CAPI (Computer Assisted Personal Interviewing) method. The work of clearing the files followed and allowed the production of the indicators