The Dynamics of Interviewing: Types and Techniques in Field Research

When researchers want to understand why people think or behave the way they do – not just what they do – they turn to interviews. As a core method in qualitative field research, the interview allows a researcher to access something that surveys and observations simply cannot: the inner world of a participant’s perceptions, attitudes, and lived experiences. But not all interviews work the same way. The type of interview a researcher chooses, and how they conduct it, shapes the depth and quality of the data they collect. This post breaks down the main types of interviews used in field research and walks through the process of conducting them effectively.

What is a research interview? 🔗

At its core, a qualitative interview is a purposive conversation – one with a clear research goal behind it. It involves at least two people: the interviewer who asks questions and the participant who responds. Unlike a questionnaire that captures surface-level answers, an interview is designed to dig deeper. It captures the meaning people assign to their experiences, their reasoning, their doubts, and their values. This makes interviews especially powerful when the research question is exploratory, sensitive, or layered in social complexity.

Interviews can be conducted face to face, by phone, or through video platforms. They can last anywhere from thirty minutes to several hours, depending on the depth of inquiry. According to Deakin University’s qualitative research guidelines, interviews are the most commonly used qualitative data-gathering technique and are frequently used alongside grounded theory, case studies, and focus groups.

Types of research interviews 🔗

Interviews in qualitative research are broadly categorized by their level of structure. Three main formats exist: structured, semi-structured, and unstructured. Each has a distinct approach and is suited to different research goals.

Structured interviews 🔗

Structured interviews follow a fixed set of predetermined questions, asked in the same order, using the same wording, to every participant. This format prioritizes consistency and comparability across respondents. Because every participant answers the same questions in the same sequence, structured interviews make it easier to identify patterns and replicate the study across different interviewers. However, this rigidity is also a limitation – participants have little room to expand on their answers, and researchers cannot follow unexpected but potentially valuable threads that emerge in conversation.

Structured interviews are sometimes considered more of a quantitative tool because they often include closed-ended or multiple-choice questions. They work well when a researcher needs standardized data across a large sample but are less suited for capturing the nuance and depth that qualitative research typically aims for.

Unstructured interviews 🔗

Unstructured interviews sit at the opposite end of the spectrum. There are no predetermined questions – instead, the researcher enters with a general topic or list of themes and allows the conversation to develop organically. The goal of the unstructured interview is to let the participant tell their own story in their own words, with the researcher prompting only when needed. This format closely resembles a natural conversation, though it is still carefully guided by the researcher’s broader research interest.

Within unstructured interviews, several sub-types exist. The non-directive interview is aimed at gathering in-depth information without a pre-planned question set. The focused interview is used when the researcher already knows the respondent and gently steers the conversation back to the core topic if it drifts. The informal conversational interview relies on spontaneously generated questions based on what emerges in the moment – common in ethnographic fieldwork where the researcher is embedded in the setting being studied.

Unstructured interviews yield rich, detailed data but are difficult to standardize and analyze. They demand considerable skill from the interviewer and can produce data that is hard to compare across participants.

Semi-structured interviews 🔗

Semi-structured interviews are the most commonly used format in qualitative research. They combine the consistency of structured interviews with the flexibility of unstructured ones. The researcher prepares a set of open-ended questions or thematic areas in advance – known as an interview guide – but is free to adjust the phrasing, order, and depth of questions depending on how the conversation unfolds.

According to the SAGE Encyclopedia of Qualitative Research Methods, the semi-structured interview is a data collection strategy where the researcher asks informants a series of predetermined but open-ended questions, with no fixed range of responses. This means participants can elaborate, digress productively, and introduce topics the researcher may not have anticipated.

Semi-structured interviews are particularly useful in exploratory research, in field studies involving multiple interviewers, and when the researcher wants both thematic consistency and genuine depth. In medical education and social science research, a typical semi-structured interview guide includes between five and fifteen predetermined questions, supplemented by probing follow-up questions during the interview itself.

Focus group interviews 🔗

Focus group interviews present questions to a group rather than an individual. They are useful for understanding group dynamics, collective meaning-making, and the social processes through which opinions form. Focus groups are particularly effective for understanding the language and terminology participants use when discussing a topic – which can then inform further survey design or individual interview questions. However, group settings can suppress minority views, and participants may be less candid about personal experiences than in a one-on-one setting.

The process of conducting interviews 🔗

Choosing the right interview type is only the first step. How an interview is conducted – from preparation to post-interview analysis – determines whether the data collected is meaningful and reliable.

Preparation and question design 🔗

Before any interview takes place, the researcher must clearly define their research objectives. Questions should emerge directly from those objectives and should be open-ended, neutral in tone, and designed to elicit participants’ perspectives rather than confirm the researcher’s assumptions. An interview guide should progress from broad, general questions to more specific or sensitive ones, building the participant’s comfort gradually.

Questions should move from simple to complex. According to best practices in qualitative research design, sensitive topics should be reserved for later in the interview, once rapport has been established. Researchers should avoid leading questions – those that suggest a particular answer – because they introduce bias and undermine the validity of the data. Piloting the interview guide with a small group before the actual data collection helps identify ambiguous or problematic questions.

Building rapport 🔗

The quality of interview data depends heavily on the relationship between interviewer and participant. Approaching interviewees with an open and curious attitude, and explaining specifically why their perspective matters, helps reduce anxiety and encourages honest responses. The interviewer should listen far more than they speak, using active listening techniques – nodding, paraphrasing, and maintaining appropriate eye contact – to signal genuine interest.

Body language provides important data too. Observing a participant’s facial expressions and posture helps the researcher gauge comfort levels and decide when to probe deeper or when to move on. Interviewers should also be aware of their own body language, ensuring they do not inadvertently signal approval or disapproval of particular responses.

Using probes effectively 🔗

Probing is one of the most critical skills in qualitative interviewing. Probes are verbal prompts that encourage a participant to clarify, elaborate, or explain a prior response – they push the conversation beyond surface-level answers toward deeper understanding. A simple prompt like “Can you tell me more about that?” or “What did that feel like at the time?” can unlock layers of meaning that a direct question alone would not access.

Researchers have identified multiple types of probes. Descriptive probes invite participants to describe a situation in more detail. Clarifying probes seek to resolve ambiguity. Explanatory probes ask participants to account for why something happened. In practice, more challenging probes – those that push for explanation or meaning – are best used later in the interview once trust has been firmly established.

Recording and transcription 🔗

Interviews should be recorded, with the participant’s informed consent, to ensure accuracy. Notes taken during the interview supplement recordings but cannot replace them – it is nearly impossible to listen actively and write comprehensively at the same time. Transcribing recordings promptly after each interview while the details are still fresh is recommended. Transcripts become the primary text from which themes, patterns, and insights are later drawn through qualitative analysis.

Interviewer bias and its management 🔗

Every interviewer brings their own identity, assumptions, and expectations to a research setting. These can influence both what questions are asked and how participants respond. Interviewer effect – where characteristics of the interviewer such as gender, race, or age affect participant responses – is a recognized form of bias in all interview formats. Social desirability bias occurs when participants give answers they believe the researcher wants to hear, rather than their genuine views.

Both forms of bias can be mitigated by writing carefully neutral questions, reinforcing that there are no right or wrong answers, and creating an atmosphere where participants feel genuinely safe to speak their minds. The researcher should also practice reflexivity – regularly reflecting on how their own background and assumptions may be shaping the research process.

Ethical considerations in interview research 🔗

Research interviews involve real people sharing real experiences, which creates ethical responsibilities that cannot be treated as secondary. Ethical guidelines in research trace back to the Nuremberg Code of 1947, which established protections for human subjects following documented abuses in the mid-twentieth century. Today, researchers are required to obtain informed consent before any data is collected. This means participants must be told the study’s purpose, what will be asked of them, how their data will be used, and that they may withdraw at any time without consequence.

Confidentiality is equally fundamental. Researchers protect participant identities by anonymizing data, using pseudonyms in reports, and storing raw data securely with access limited to authorized personnel. When interviews address sensitive topics – personal trauma, stigmatized behavior, marginalized identities – researchers must be especially careful to avoid causing emotional harm. Qualitative researchers should aim to establish mutually respectful relationships with participants, recognizing that participants are not merely data sources but people whose dignity and wellbeing matter throughout the research process.

Institutional Review Boards (IRBs) – bodies that include academic and non-academic scholars – review research protocols before data collection begins to ensure that ethical standards are met, particularly in social science and health research where interviews touch on behavior, attitudes, and sensitive personal experiences.

Choosing the right interview type 🔗

The decision about which interview type to use should be driven by the research question and the nature of the topic. Structured interviews suit situations where comparability across participants is the priority. Unstructured interviews are most appropriate when the researcher wants to follow wherever the participant leads, particularly in exploratory or ethnographic work. Semi-structured interviews are the go-to choice for most qualitative field research – they balance focus with flexibility, giving the researcher control over key topics while leaving room for unexpected insight.

It is also worth considering participant characteristics. Some individuals are more comfortable with a conversational format; others may feel more at ease with clear, defined questions. The setting matters too – a community field study may call for informal conversational interviews, while a study on professional experiences might benefit from a structured guide.

What do you think? Does the type of interview a researcher chooses change not just the data they collect, but the kind of relationship they build with their participants? And in contexts where participants come from marginalized or vulnerable communities, how should researchers balance the need for rich, honest data with the ethical obligation to avoid harm?

References

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