Interviews are evenly spread over a four week period, and the data represent the average for the reference month. EBs have well defined boundaries each containing about 100 to 150 living quarters or about 600 persons. EBs are also drawn along the gazette boundaries. Samples are drawn independently within each level of the secondary stratum. All households and persons within the selected LQs are canvassed.
Information is recorded using paper forms.
Field checks are made to identify and correct any errors or omissions while the survey is underway. A person's occupation and industry classification refer to the main activity. Stratum Population of gazetted towns and built-up areas 1. Metropolitan 75,000 and above 2. Urban large 10,000 to 74,999 3.