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• <br /> Three. callbacks- are. made, if necessary, to,-a number .before it, ..is <br /> replaced in the sample; this practice ensures that ,easy-to-reach <br /> respondents are not over-represented in- the final sample. . <br /> Questionnaires are edited by the supervisor, and respondents are <br /> re-contacted .if . clarification should,. be required. <br /> Prior to the start of interviewing, the questionnaire will, be <br /> pretested with persons typical of those in the sample. Feedback <br /> from interviewers is used to make final adjustments. to the <br /> questionnaire. All- interviewers; are briefed by the project <br /> -director or supervisor .before interviewing starts. The identity <br /> of the client is not normally revealed to the interviewer or . <br /> • respondent, nor is any other information about the project which <br /> could bias the interviewers : The purpose of the briefing is to <br /> assure that interviewers understand the questions, skip patterns <br /> and procedures. <br /> Data Processing <br /> The coding of open-ended questions and overall code design are <br /> the responsibility of the Director of Data Processing. Normally, <br /> 20 percent or more of the questionnaires are read and studied <br /> before- the codes for open-ended questions are set. Mid-Continent <br /> Research requires that data entry ( "keypunching" ) be 100 percent <br /> verified. <br /> 1 <br /> Tabulation and statistical processing are done on Mid-Continent' s <br /> own IBM-AT computer system. Extensive cleaning and logic <br /> ( 6 ) <br />