The paper describes an approach of improving Slovenian Computer Science Education in general secondary school by forming an active and sustainable Computer Science Community of Practice (CS CoP). In project NAPOJ three systems teachers use in teaching programming are combined: CS e-textbook, LMS Moodle and TOMO, automatic assessment system for learning programming. Group of master teachers were selected, who prepared the initial set of in-class resources and material at a half a week workshop. This was followed by the regional workshops for other CS teachers throughout the Slovenia and run by master teachers. Development of CoP was observed and analyzed through various data gathering tools, such as questionnaires, discussions and observations, and preliminary results are highlighted.