How the Subject should be contacted, The choices are:
1- Mail Questionnaire: it is the Best way to reach people who would not give personal interviews or could be biased or distorted
By interviews
Telephone Interviewing:
It Is the Best method for gathering information quickly, but it has to be short & not too personal
Personal Interviewing:
Most expensive – additional observations – it is
Subject to interviewers bias or distortion
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