It calls for knowledge of how the information will be tabulated and how it will be processed. Also, it demands good judgement in putting together all the elements. An effective questionnaire is one that is economical in human resources, equipment, and costs to produce the form as well as to use it. Mapping Maps have a number of uses in censuses, but they serve primarily to ensure that all parts of the country are assigned to be enumerated and that the data are allocated to the proper administrative units. This is accomplished by dividing the total area of the country into small areas for individual enumerator assignments and instructing enumerators in the use of maps in taking the census.
Maps are also very valuable in census planning and presentation and analysis of the results.
A mapping program should not be considered as part of one census or survey. Once maps are produced, they can be updated for use in intercensal sample surveys and in future censuses. The principal issue for most countries will be the manner in which the census operation is organized and actually carried out. In this respect, nothing is more critical than the adequacy of the enumeration. If there are any serious deficiencies in the enumeration, there is little that can be done to overcome them at the processing stage, even with complex data editing and computer imputation procedures.