This theoretical and practical work, which is easy to understand for students in 3ème des humanités, option Secrétariat-Administration, will also serve as a compendium for teachers wishing to learn computer science, as it conforms to the national curriculum for Primary, Secondary and Technical Education in the Democratic Republic of Congo.In this book, we have focused on concepts such as :carrying out file processing procedures using MS Word and hypertext links ,analyzing information and writing reports using MS PowerPoint, analyzing documents and proposing solutions by creating graphics ,prioritizing work to be done on a daily basis using MS Outlook, planning travel and vacations using MS Outlook, present work at a meeting using PowerPoint animations ,good command of the operation and use of the scanner ,good command of the basics of computer networks ,teach students the types of data backups on a medium ,good command of sorting data according to ascending order of set criteria.