Paul F. Lazarsfeld’s “The Art of Asking Why,” originally published in 1935, examines the methodological underpinnings of effective questionnaire formulation in market research, focusing on the challenges of eliciting accurate reasons for consumer behavior. Lazarsfeld introduces three critical principles for constructing meaningful “why” questions: specification, division, and tacit assumption. The principle of specification highlights the need to precisely define what determinants are being investigated, avoiding the ambiguity of broad “why” formulations. The principle of division emphasizes adapting questions to fit the respondent’s personal experience, ensuring greater validity and completeness in reported motivations. The principle of tacit assumption addresses the unspoken understandings underlying responses, stressing the risk of missing key determinants that respondents take for granted. Lazarsfeld argues that careful adherence to these principles enables researchers to obtain the “complete motivational set-up of the first degree,” thereby producing data suitable for both statistical analysis and actionable insights in marketing practice. The article integrates psychological theory with practical examples from market and leisure studies, advocating a flexible, respondent-centered approach to questionnaire design as an antidote to methodological pitfalls and misinterpretations frequently encountered in survey research.