The first books in Polish about the Pascal programming language appeared in the late 1970s, and were soon followed by a Polish translation of Niklaus Wirth's book "Algorithms + Data Structures = Programs." At that time, many efforts were made to prepare teachers to teach informatics in schools, and Pascal was one of the topics taught,…

In this paper, we present an activity to introduce the idea of public-key cryptography and to make pre-service STEM teachers explore fundamental informatics and mathematical concepts and methods. We follow the Theory of Didactical Situations within the Didactical Engineering methodology (both widely used in mathematics education research) to…

Brazilian initiatives aimed at the insertion of information and communication technologies (ICT) in K-12 education took their first steps in the 1970s, when several countries focused their efforts on the use of ICT in the educational context. Since the early 1980s, a number of public policies have been created that have given rise to various…

This article describes several sessions of a larger case study that examined cognitive categories for library information in a group of children in kindergarten through grade 4. While the initial motivation for the project was pragmatic in nature, theoretical issues relating to people's cognitive categories for information are examined as well.…