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114 Guidebook for Conducting Airport User Surveys a weight factor can be calculated. The sample percentage will naturally vary with fluctuat- ing demand and a static interviewer resource. Time periods such as one-hour intervals, or peak and off-peak periods, could be used. Thus the weight assigned to each interview dur- ing the morning peak will be higher than the weight assigned to each interview during a slow mid-morning period. A similar approach can be followed for taxis, parking, and other modes. Passenger counts. Given the total number of originating or terminating passengers, a weight can be calculated based on the number of passengers covered by the interviews compared with this total number. An hourly weight can be calculated using the same approach as that for vehicle counts by time of day. A further refinement on the passenger-based weight factor can be calculated when passenger loads by flight are available, although the caution given in Sec- tion 5.5.2 about the use of flight-specific weights should be noted. Other weighting factors can be specified and calculated, depending on the available data and the goals of the survey. 5.10 Checklists Conducting airport passenger surveys involves numerous people conducting many different tasks. Checklists are a good way of identifying tasks, monitoring progress, and ensuring that all tasks are done. Checklists are particularly useful for organizational tasks involving a number of people. Common types of checklists used in passenger surveys, and examples of items covered, are as follows: Preparation of contract--defining contract, taking care of legal and administration details, setting survey schedule, preparing the RFP, defining evaluation criteria, determining where to publicize the RFP and/or to whom to send it, holding pre-bid meeting, conducting proposal evaluation and contractor selection (holding interviews if required), informing bidders, nego- tiating contract, obtaining legal approvals and signed contract, holding project initiation meeting. Questionnaire development--getting input from all parties, preparing initial draft, reviewing, formatting, conducting pre-test and pilot test (including printing or programming EDCDs), making final changes, final printing or programming of EDCDs. Training--dates, venue (including seating, display boards or projector, etc.), trainers, trainees, other project team members to be present, parking, airport tour (with escort if trainees are not badged), curriculum content, handouts (instructions, questionnaires, procedures, sched- ules, contingency plans, etc.), EDCDs, walkie-talkies, development of interviewing skills, prac- tice interviews, testing, retraining. Forms and supplies--approvals for conducting survey (as required from airport operator, air- lines, etc.), letter from sponsoring organization authorizing interviewers to conduct survey, printing of questionnaires (different colors for different versions), timesheets for staff, survey log books and flight record log sheets, check-out/check-in sheets for EDCDs, radios and other equipment, pre-paid mail-back envelopes, flight gate schedule sheet. Logistics--badging of interviewers, organizing of survey field office, equipment for field office (printer, copier, computers, Internet access, telephone, fax machine, power extension cords, etc.), storage space in field office for supplies and interviewers' personal items, locking and unlocking of field office, vests and/or name tags for interviewers, survey equipment (EDCDs and chargers, pens or pencils, clipboards, and bags), communication equipment (walkie- talkies and chargers), parking for staff. Contingency plans--interviewers absent or arriving late, cancelled or delayed flights, equipment malfunction (EDCDs, copier, printer, computer, Internet, walkie-talkie, etc.),