Unit 3: Data Collection Tools

1. Interviewing: Techniques and Pitfalls

An interview is a primary method of data collection involving a direct, face-to-face (or telephonic) conversation between a researcher (interviewer) and a subject (respondent).

Interview Techniques (Types)

1. Structured Interview:
   • The interviewer asks a fixed set of questions (from a *schedule*) in a standardized order.
   • There is no deviation. It is like a verbal questionnaire.
   • Use: Large-scale surveys where statistical comparison is needed.
2. Semi-Structured Interview:
   • The interviewer has a list of key questions or themes to cover, but has the flexibility to change the order, probe for more details, or ask follow-up questions.
   • Use: Qualitative research, case studies.
3. Unstructured (or In-depth) Interview:
   • A flexible, conversational-style interview with no pre-set questions. The researcher has a broad topic and lets the respondent talk freely.
   • Use: Exploratory research, to understand deep motivations and beliefs.

Pitfalls of Interviewing (Common Problems)

• Interviewer Bias: The interviewer's own opinions, body language, or tone of voice (e.g., nodding in agreement, looking surprised) can influence the respondent's answers.
• Leading Questions: A major error. A question that is worded in a way that *suggests* a "correct" answer.
  • Bad: "Don't you agree that the new policy is a failure?"
  • Good: "What are your thoughts on the new policy?"
• Social Desirability Bias: The respondent gives an answer they think is "socially acceptable" or "correct," rather than their true opinion.
  • Example: People may over-report their voting frequency or under-report their prejudices.
• Lack of Rapport: If the interviewer is cold or judgmental, the respondent may become guarded and give short, unhelpful answers.

2. Questionnaire: Meaning, Merits, and Demerits

Meaning: A questionnaire is a data collection instrument that consists of a set of questions to be answered by the respondent. The key feature is that it is self-administered. The respondent reads the questions and fills in the answers themselves.

Examples: A Google Form, a paper survey sent by mail, a feedback form in a restaurant.

Merits (Pros)	Demerits (Cons)
Low Cost: Can be distributed to thousands of people (via email, web) for very little money.	Low Response Rate: Many people who receive a questionnaire will not bother to fill it out.
No Interviewer Bias: The respondent's answers are not influenced by the presence of an interviewer.	No Clarification: If the respondent misunderstands a question, there is no one to explain it. This leads to invalid answers.
Anonymity: Respondents may feel more comfortable giving honest answers to sensitive questions (e.g., about income, personal habits) because it is anonymous.	Literacy is Required: Can only be used with populations who can read and write.
Convenience: The respondent can fill it out at their own pace and time.	Lack of Control: You don't know *who* actually filled it out (e.g., a boss might fill out the form for their employee).