This report is the result of business practices conducted in ACOLMIPYME, as book-keeper assistant with the general objective of supporting and carrying out book keeping procedures SOLUCIONES SERVICIOS Y SUMINISTROS EMPRESARIALES S.A.S through Acolmipyme in the term of 2019. The Colombian Association of Mipymes, ACOLMIPIME is an organization aimed to promote the development of small and medium-scale companies by supporting their common growth. Nowadays ACOLMIPIME has 15 associated companies, among them are NIIF, NIA, Capacitaciones, Consultoría & Outsourcing Contable, Revisores fiscales, Asesores tributarios & Financieros, which offer book keeping services. The company was assigned for book keeping of SOLUCIONES SUMINISTROS Y SERVICIOS EMPRESARIALES S.A.S. The company accomplished the requirements to implement book keeping , thus it is a new branch within the organization. It is in charge of supervising all the information issued and received, in order to evaluate and implement controls. The work was done in the facilities of the organization and in the main office of F & A., according to the requirements of book keeper assistant. The internship was done from February 18 to May 15, 2019 through a working shift of 8 and 4 hours from Monday to Saturday, such labor was completed in 330 hours and fulfilled the established requirements for the professional assistantship. The previous work implied requests for administrative, accounting and financial information to the SSSE company, documentation, preparation and management of planning and execution in work papers, as well as examination of the administrative, accounting and financial information to the SSSE company; verification of the compliance of the internal control and delivery of the report of the auditors’ findings in SSSE. The activities carried out during the internship favored the development of the proposed objectives required by SSSE Company and to learn the professional work as accountant upon graduation. In this way, it was possible to contribute to the needs of the company in which the internship was took place.