Understanding Interview Types: Structured, Semi-Structured, and Unstructured

Choosing the right interview type is one of the most important decisions when designing an AI-moderated interview on Qualz.ai. The platform supports three foundational interview modes — Structured, Semi-Structured, and Unstructured — as well as three specialized modes for specific research goals. This guide explains the differences, when to use each, and how they affect both the AI moderator's behavior and the interview guide that is generated.

The Three Core Interview Types at a Glance

How Interview Type Affects Your Study

1. Interview Guide Structure

The interview type determines the shape of your guide in the structured editor:

• Structured — Each item is a standalone question. You can edit the text inline, reorder with drag handles, and optionally assign a stimulus image. No probes are included.

• Semi-Structured — Each item is a main question with an attached probe bank. You configure a probe policy per question (Ask all, Ask the most relevant, Ask at least one, or Only if needed) and set a max probe count to limit follow-ups. Each question can also have stimulus assigned.

• Unstructured — Each item is a topic with an opening prompt (how the AI starts the conversation about this area), exploration guidance (key areas to cover), and optional probing guidelines. Topics can have stimulus assigned.

2. AI-Generated Interview Guides

When you click Generate with AI, the platform generates a complete guide in the structured format matching your mode:

• Structured generates standalone questions calibrated to your time limit (e.g., 5-8 questions for a 10-minute interview).

• Semi-Structured generates main questions, each with a probe bank of follow-up questions. The AI allocates approximately 2-3 minutes per question-and-probe pair.

• Unstructured generates high-level topics with opening prompts and exploration guidance rather than specific questions. Each topic is designed to be explored over 3-5 minutes.

3. AI Moderator Behavior During the Interview

The interview type directly controls how the AI moderator conducts the conversation:

• In Structured mode, the AI asks each question exactly as written, without modification or improvisation. After a brief acknowledgment, it moves promptly to the next question. Stimulus images assigned to a question are displayed when that question is asked.

• In Semi-Structured mode, the AI can rephrase questions for clarity, adjust the order slightly for natural flow, and select follow-up probes from the probe bank according to the configured probe policy. It skips probes when the participant has already provided sufficient depth.

• In Unstructured mode, the AI uses opening prompts to start each topic, follows exploration guidance to cover key areas, and follows the participant's lead. It creates its own questions in the moment, grounded in the topic framework you defined.

4. Consistent Behaviors Across All Types

Regardless of the interview type you choose, the AI moderator always:

• Uses the configured AI interviewer name in its greeting and throughout the session
• Asks only one question per turn — never double-barreled questions
• Maintains a warm, respectful, and professional tone
• Conducts the interview in your selected language without code-switching
• Handles unclear audio or silence by politely asking for clarification
• Gently guides off-topic responses back to the study focus
• Respects participant boundaries, allowing them to skip uncomfortable questions
• Displays assigned stimulus images at the appropriate moment based on explicit per-item assignments

Choosing the Right Type for Your Research

Choose Structured when:

• You need to compare responses across participants using identical questions
• Your research requires regulatory compliance or standardized data collection
• You have a well-defined set of questions and don't need exploratory depth
• You're running a large-scale study where consistency is more important than depth

Choose Semi-Structured when:

• You want a balance between structure and conversational depth
• You have core questions but want the flexibility to explore interesting responses
• You're conducting most types of qualitative research (user research, market research, academic studies)
• You want the AI to adapt naturally while still covering all your key topics

Choose Unstructured when:

• You're in the early stages of research and want to discover themes you haven't anticipated
• You want participants to lead the conversation and share what matters most to them
• You're exploring complex, sensitive, or deeply personal topics
• You value depth and narrative richness over standardized data

Beyond the Basics: Specialized Interview Modes

In addition to the three core types, Qualz.ai offers three specialized interview modes designed for specific research methodologies:

• Problem Discovery — Designed to uncover problems, frustrations, and unmet needs through story-based prompts
• Customer Feedback — Optimized for collecting actionable product feedback from active users
• Value Proposition Testing — Structured to present a concept and gather honest, unbiased reactions

Each specialized mode uses its own AI moderator personality and conversation flow. Learn more in the Specialized Interview Modes guide.

---

Not sure which interview type is right for your research? Our research experts can help you select the best approach for your study goals and methodology. Book a call →

Next Steps

• How to Create an AI-Moderated Interview — Step-by-step creation guide
• Stimulus Images in Interviews — Complete guide to adding visual materials
• How to Generate Interview Questions and Guidelines with AI — Learn how AI generates tailored questions
• How to Configure Your Interview Study — Set up access controls, language, and voice options