Data Collection

The FOS permanent Field staff who were resident in the enumeration areas were responsible for data collection during the survey.  These interviewers conducted interviews with the households. There were seven interviewer visits to each selected household at  a minimum of four-day interval in a cycle of 30 days.  A dairy of daily consumption and expenditure was used to support the interviews.

Composition of the Team for data Collection  

Every State had 20 roving teams, while FCT, Abuja operated with 10 teams.   A team was made up of one supervisor  and one enumerator. 

The teams were structured into two groups, which worked alternatively each month to cover the selected  EA.

Supervision and Quality Control

A number of measures were put in place to ensure that the NLSS data were of good and acceptable quality.  For instance, a supervisor was attached to each team to observe interviews and confirm the pre-selected households. He was to verify and edit completed questionnaires.  The State officers and zonal controllers conducted regular monitoring visits to the EAs.  Headquarters monitoring groups also visited states on quarterly basis, for on-the- spot assessment of the quality of work.  An independent firm was engaged to monitor the fieldwork in the States from the commencement to the end of the survey.

 A World Bank Mission team from Washington also took part in the monitoring exercise.
 

Retrieval

Completed Questionnaires were sent to zonal offices from the States for onward transmission to the NBS headquarters for data extraction and data processing.  The retrieval of records was done on a monthly basis.