1. Andreas Ioannou Kassetas,

    http://users.sch.gr/kassetas

  2. Eleni Beniata, Vasilis Tselfes, Maria Tsapali
    Faculty of Early Childhood Education, University of Athens, eleni_beniata@yahoo.gr
    Faculty of Early Childhood Education, University of Athens, tselfesv@ecd.uoa.gr
    Faculty of Primary Education, University of Athens, ma.tsa.08@hotmail.com

  3. M. Livitziis, E. Loizidou, A. Scholinaki, and C. P. Constantinou
    Research Group of Learning in Science and Enviromental Science, University of Cyprous
    mikelivitzis@yahoo.com, s_schgr@yahoo.co.uk, c.p.constantinou@ucy.ac.cy

  4. Christina Papasotiriou, Vasilis Tselfes,
    Faculty of Early Childhood Education, University of Athens, gpilianidis@yahoo.gr
    Faculty of Early Childhood Education, University of Athens, tselfesv@ecd.uoa.gr