Definition
An interview is a direct, purposeful conversation between a researcher and a respondent, aimed at obtaining relevant information for research objectives.

Introduction
Interviews bring the human voice into data. They allow nuance, emotion, and depth—qualities that no questionnaire or statistical table can fully express. They bridge the gap between numerical analysis and human experience.

Explanation
Structured interviews follow a standardized format, with predetermined questions asked in a fixed order. They yield comparable data suitable for quantitative analysis. For instance, job recruitment interviews using rating scales on experience and skills are structured.

Unstructured interviews, however, are more conversational. The researcher follows the respondent’s cues, probing deeper into emerging topics. This flexibility makes them ideal for exploratory and qualitative studies. Semi-structured interviews lie between the two, offering both consistency and adaptability.

The success of interviews depends heavily on interviewer skill—building rapport, asking unbiased questions, and maintaining neutrality. Limitations include interviewer bias, respondent dishonesty, and time intensity. Recording and transcribing ensure accuracy but raise ethical concerns of privacy.

Key Takeaways
Interviews allow personal interaction and insight but require careful management of bias, ethics, and emotional influence.

Real-World Case
McKinsey & Company’s leadership research involved thousands of semi-structured interviews across global industries, revealing key behavioral traits of effective leaders—data later used in its Leadership at Scale framework.
Reference: https://www.mckinsey.com