CodES: visualization tool for developing algorithmic thinking

CodES (CODification with Inputs and Outputs) is a visualization tool that bases its action on the simplest artifact of computational analysis, which is the input and output diagram, for the purpose of generating an abstraction process for algorithm design and writing, for the student to focus on first understanding the problem to be solved through its essential elements while intuiting the computational interface to be built and their respective design and coding diagrams from the outset. CodES was validated using a quantitative approach with descriptive type research and by experimental design with control group and post-test. In addition, a parametric technique was used to check the statistical difference between data obtained in the research process which together with a Usability test and an Eye-tracking technique, suggested the use of CodES in a first computer programming course.