The consolidated guidelines are complemented by an operational handbook which is designed to assist with implementation of the WHO recommendations by Member States, technical partners and others who are involved in the management of patients with DR-TB. The WHO Operational Handbook on Tuberculosis, Module 4: Treatment - Drug-Resistant Tuberculosis Treatment provides practical guidance on how to put in place the recommendations at the scale needed to achieve national and global impact. The operational handbook provides practical information and tools that complement the recommendations in the guidelines. The strategies described in the operational handbook are based on the latest WHO recommendations which were formulated by Guideline Development Groups using the GRADE approach. In many cases however, the recommendations in their current form lacked sufficient clinical and programmatic detail, which is important for implementation. This operational handbook complements the guidelines with practical advice based on best practices and knowledge from the fields such as pharmacokinetics, pharmacodynamics, microbiology, pharmacovigilance and clinical and programmatic management.