This volume provides an overview of well-established methods optimized for diverse archaeal model organisms and is a source of protocols facilitating access to the molecular and cellular biology characterization of these fascinating organisms. Chapters are divided into five parts detailing available genetic tools, molecular and cellular biology methods, strategies to study the ecophysiology of archaea, and classroom protocol. Each main thematic part is also introduced by future-oriented and authoritative primers. Written in the format of the highly successful Methods in Molecular Biology series, each chapter includes an introduction to the topic, lists necessary materials and reagents, includes tips on troubleshooting and known pitfalls, and step-by-step, readily reproducible protocols.