This article provides researchers with a comprehensive guide on how to design a high-quality mixed methods research study. It emphasizes the importance of understanding and carefully considering each dimension of mixed methods design, with a focus on validity. The seven major design dimensions discussed are: purpose, theoretical drive, timing (simultaneity and dependency), point of integration, typological versus interactive design approaches, planned versus emergent design, and design complexity. Additionally, ten secondary dimensions are highlighted as important considerations during the design process. The article also includes two case studies to illustrate how mixed designs can be constructed in practice. The authors advocate for a flexible and creative approach to designing mixed methods research, emphasizing the need to balance simplicity and complexity to achieve robust and valid conclusions.This article provides researchers with a comprehensive guide on how to design a high-quality mixed methods research study. It emphasizes the importance of understanding and carefully considering each dimension of mixed methods design, with a focus on validity. The seven major design dimensions discussed are: purpose, theoretical drive, timing (simultaneity and dependency), point of integration, typological versus interactive design approaches, planned versus emergent design, and design complexity. Additionally, ten secondary dimensions are highlighted as important considerations during the design process. The article also includes two case studies to illustrate how mixed designs can be constructed in practice. The authors advocate for a flexible and creative approach to designing mixed methods research, emphasizing the need to balance simplicity and complexity to achieve robust and valid conclusions.