This introductory module lays the groundwork for understanding how questionnaires function as essential tools in research and data collection. Learners explore the meaning and purpose of questionnaires, examine how survey instruments are designed and applied, and identify the types of questionnaires used across different contexts. Through interactive examples and short quizzes, participants build a solid foundation for designing effective, reliable, and ethical questionnaires.

Questionnaire Biases & Errors explores the subtle yet powerful factors that distort data quality in surveys and research instruments. Learners will examine how wording, structure, emotional tone, and cognitive limitations influence respondent behavior and the reliability of collected information. Through interactive lessons and applied examples, the course equips participants to identify, prevent, and correct bias at every stage of questionnaire design. By the end of this module, learners will be able to:recognize common bias types affecting questionnaire validity; apply structural techniques that minimize order and format effects; evaluate social and cognitive influences on respondent accuracy and honesty; and design balanced, bias‑resistant questionnaires for valid and ethical data collection.

This module provides a step-by-step guide to testing, validating, and ensuring the reliability of a survey instrument before full-scale deployment.