1. THE PROBLEM SOLVING AND THE STUDY OF SCIENCE AND TECHNOLOGY / LA PROBLEMATISATION ET L’ETUDE DES SCIENCES ET DE LA TECHNOLOGIE. Authors: IOAN CIASCAI, LILIANA CIASCAI.2. STUDENTS AND TEACHERS` COMPETENCY TO PERFORM EXPERIMENTAL ACTIVITIES. Authors: IOAN CIASCAI, LILIANA CIASCAI.3. ELABORATING AND EVALUATING VISUAL REPRESENTATIONS IN SCIENCES TEXT BOOKS. Authors: IOAN CIASCAI, LILIANA CIASCAI.4. THE USAGE OF THE PORTFOLIO IN THE DIDACTICAL ACTIVITY AT UNIVERSITY. Authors: LILIANA CIASCAI, IOAN CIASCAI.