Computer-aided tool for the teaching of relational algebra in data base courses

This article describes the design and implementation of computer-aided tool called Relational Algebra Translator (RAT) in data base courses, for the teaching of relational algebra. There was a problem when introducing the relational algebra topic in the course EIF 211 Design and Implementation of Databases, which belongs to the career of Engineering in Information Systems of the National University of Costa Rica, because students attending this course were lacking profound mathematical knowledge, which led to a learning problem, being this an important subject to understand what the data bases search and request do RAT comes along to enhance the teaching-learning process.It introduces the architectural and design principles required for its implementation, such as: the language symbol table, the gramatical rules and the basic algorithms that RAT uses to translate from relational algebra to SQL language. This tool has been used for one periods and has demonstrated to be effective in the learning-teaching process.  This urged investigators to publish it in the web site: www.slinfo.una.ac.cr in order for this tool to be used in other university courses.

Professional Autonomy. Key Competence for Teachers in Commercial Education

The way in which the teaching autonomy is materialized, considered as part of the path traveled by the teaching community on their way to become owners of the disciplinary knowledge and the required pedagogical competencies to practice their role has motivated this paper.  For success, Commercial Education requires the urgent transformation of the teaching role and the development of key competences to promote interdisciplinary integration, academic and administrative leadership and the use of contemporary pedagogies.  The level of awareness reached by the teaching group about the impact of the learning that is promoted within the educational context will allow the empowerment of the knowledge that comes from the relationship between theory and practice-key element for professional autonomy.