This AMEE Guide outlines a systematic, seven-step process for designing high-quality questionnaires, with a focus on developing survey scales for use in medical education research. The process emphasizes the importance of creating reliable and valid survey instruments that accurately measure the intended constructs. The steps include conducting a literature review, conducting interviews and focus groups, synthesizing the information from these sources, developing items, collecting expert validation, conducting cognitive interviews, and performing pilot testing. The guide highlights the need for careful item development and the importance of ensuring that survey items are clearly worded and understood by respondents. It also discusses the importance of validity and reliability in survey design, and how these can be assessed through various methods such as content validity, response process validity, internal structure, and relationships with other variables. The guide also provides practical advice on how to write effective survey items, select appropriate response options, and ensure that the survey is well-designed and valid. The authors emphasize the importance of following a systematic, evidence-based approach to questionnaire design to improve the quality of medical education research.This AMEE Guide outlines a systematic, seven-step process for designing high-quality questionnaires, with a focus on developing survey scales for use in medical education research. The process emphasizes the importance of creating reliable and valid survey instruments that accurately measure the intended constructs. The steps include conducting a literature review, conducting interviews and focus groups, synthesizing the information from these sources, developing items, collecting expert validation, conducting cognitive interviews, and performing pilot testing. The guide highlights the need for careful item development and the importance of ensuring that survey items are clearly worded and understood by respondents. It also discusses the importance of validity and reliability in survey design, and how these can be assessed through various methods such as content validity, response process validity, internal structure, and relationships with other variables. The guide also provides practical advice on how to write effective survey items, select appropriate response options, and ensure that the survey is well-designed and valid. The authors emphasize the importance of following a systematic, evidence-based approach to questionnaire design to improve the quality of medical education research.