This paper presents an experience of standardization in the development of subject guides for the Information and Technology Center (CITec), Faculty of Natural Sciences, Río Piedras Campus, University of Puerto Rico. Thematic guides are information resources that support research in different disciplines. CITec needed to update their own guides and develop new ones. To work the initiative, we used an open source tool and applied the systematic, planned and structured five phases of the ADDIE model consisting of analysis(A), design(D), development(D), implementation(I) and evaluation(E), to both the guides and the whole work. As a result, topic and specialized guides were developed, letting users retrieve reliable information from the SubjectsPlus open source platform. The realization of the project facilitated the standardization of the guides, their online creation and immediacy of their updates via their website.