Focus group discussions are one of the cornerstones of qualitative research - both in academic and applied contexts such as market and media research. Focus groups play a central role in the (further) development of the modern everyday world, for example in optimizing services, products, brand management, television formats, films, or political programs. This book provides an introduction and serves as a practical handbook for the conceptualization, execution, and evaluation of focus groups in social science and business psychology contexts. Numerous practical examples are provided for illustration. Based on the reflection of numerous studies, typical mistakes and pitfalls are identified, along with practical tips for creating guidelines, moderation, analysis, and grounding of consultations.