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Planning a Survey 19 port. Other agencies that are likely to have an interest in the results of airport user surveys include local air quality management agencies, state aviation agencies and transportation departments, local economic development or tourism organizations, the Federal Aviation Administration, and other federal transportation agencies involved in funding airport ground transportation infra- structure. Conversely, an airport user survey that is sponsored by an agency other than the air- port operator may provide an opportunity to gather information that the airport operator is interested in, but is of less interest to the survey sponsor. Even in cases where the survey sponsor and other organizations are interested in obtaining information on the same broad issue, such as ground transportation mode use, the detailed needs of each agency may differ. For example, regional transit agencies may be interested in how airport travelers using public transit access the transit system, whereas this may be of less interest to the airport operator. Modifying the scope of an airport user survey to meet the information needs of other agencies will generally increase the cost and complexity of the survey but will generally be less costly and provide more comprehensive information than performing separate surveys. It may also present opportunities for cost sharing. If there are other organizations that are likely to have an interest in the results of the survey, it is a good idea to coordinate with them at an early stage in the planning process to discuss whether the survey can meet their specific information needs. It may be helpful to form a coor- dinating group with representatives from the survey sponsor and the other organizations. This group can provide input on planning and design of the survey. The extent to which staff from external agencies should participate directly on the survey planning team will depend on the scope of the survey and the level of involvement of those agencies in funding the work. 2.5 Preparing the Survey Budget Part of the planning process is preparing the survey budget. Ideally, this takes place after defin- ing the survey purpose, determining the survey method and considering the survey frequency. The budget will need to consider the tasks involved in further planning and then implementing the sur- vey project. If a budget has already been set, it is important to check whether it is realistic. If not, the project manager may have to change the scope of the survey or seek additional funding. 2.5.1 Project Tasks The first step in preparing a survey budget is to identify all the tasks that are required to per- form a successful survey. The following list may assist the survey sponsor in developing the pre- liminary budget. Survey design--includes specifying sampling strategies, designing questionnaires, estimating the required number of interviewers required, and determining which parts will be done with internal resources or by a contractor. Pre-test and pilot tests--required unless repeating a well-established survey with experienced staff, as discussed in Section 4.7. Survey setup--includes the hiring of temporary staff, any necessary equipment and software (rental or purchase), printing of forms, and other survey logistics. Conducting the survey. Data entry and cleaning--electronic transfer or manual data entry, as well as the cleaning of the data for inconsistencies and transcription errors. The cleaning phase is frequently underestimated. Data analysis--discussed further in Section 4.11.