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 guidelines that are generated.

The Three Core Interview Types at a Glance

How Interview Type Affects Your Study

1. AI-Generated Interview Guidelines

When you click Generate with AI on the interview creation page, the platform generates different types of guidelines depending on your selected interview type:

• Structured generates a numbered list of standalone questions organized by topic. No probing questions are included. The AI calibrates the number of questions to your selected time limit (e.g., 5-8 questions for a 10-minute interview).

• Semi-Structured generates main questions, each with an optional probing question underneath. The AI ensures the total count of main questions stays proportional to your time limit, allowing 2-3 minutes per question-and-probe pair.

• Unstructured generates high-level topics with subtopics rather than specific questions. Each topic is designed to be explored over 3-5 minutes, with subtopics serving as guideposts rather than rigid scripts.

2. 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 of the participant's response, it moves promptly to the next question.

• In Semi-Structured mode, the AI can rephrase questions for clarity, adjust the order slightly for natural conversational flow, and ask a single follow-up probe per main question. It will skip probes if the participant has already addressed the topic.

• In Unstructured mode, the AI treats the guidelines as a flexible checklist of themes. It starts with broad, open-ended prompts (e.g., "Tell me about your experience with...") and follows the participant's lead, exploring their thoughts deeply while ensuring all topics are covered.

3. Consistent Behaviors Across All Types

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

• 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
• Signals completion with a closing phrase so the platform can detect the interview has ended

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.

Next Steps

• How to Create an AI-Moderated Interview — Step-by-step creation guide
• 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