This book has been prescribed for Section Officers Examination for Secretariat Service and also for examinations conducted by the various subordinate departments of the Central Government. Fully revised and updated in all respects. Has 2 parts, Part A- Manual of Office Procedure Part B- Notes on Office Procedure. Part A has been revised based on the Fifteenth Edition of the Central Secretariat Manual of Office Procedure, 2019, which is a comprehensive guide for process management in Secretariat Offices. It has 16 Chapters with 3 new chapters on Decision Making in the Govt, Knowledge Management and Digitization Framework. All Appendices have been incorporated to facilitate easy adoption by Ministries/ Depts. The topics covered exclusively in the Notes on Office Procedure are dealt with in Part B. It has 15 Chapters. Definitions have been categorized as Glossary and given after contents of CSMOP We trust this book will prove to be very useful for all administrative offices and for all departmental exams.