The 4th and the 6th Regional Centres for Educational Coordination, the 4th Lyceum of Keratsini, Ralleio Junior and Senior High Schools for Girls of Pireas organized a two-day seminar for Science teachers at Ralleio amphitheater on Friday the 13th and Saturday the 14th April 2019. At the seminar, Ralleio Director Dr Sarantos Oikonomidis presented a paper entitled “Activity on horizontal projectile modelisation using the processes of computational thinking and formative evaluation”.