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72 Guidebook for Conducting Airport User Surveys · Lessons learned. · The data. Of all the components of the survey, the data are the most valuable. This information, after all, is what the money was spent to collect. Even after the analysis is completed, these data will be invaluable in the future. 4.14 Summary This chapter has covered the general aspects of planning an airport user survey and outlined issues common to all surveys. Planning tasks specific to the particular type of survey to be con- ducted are described in the following chapters. It is clear that planning an effective airport user survey requires careful consideration of a large number of different factors. It follows that adequate resources and time need to be allocated to the planning stage. The appropriate level of resources and lead time will vary with the circum- stances of each survey--in particular, whether the survey is being performed for the first time or is repeating a former survey. For an air passenger survey with several thousand respondents being performed for the first time, the planning stage could require as much as 20% of the overall budget and should commence at least six months before the planned data collection. The time required is considerable, but the quality of the resulting information will depend on the effort devoted to sound planning.