“…Most studies describe positive effects of their interventions. A number of studies evaluated the CT skills and found improvement on post-tests (both self-assessment and actual skill tests) [2,15,17,32,45,47,49,51,63,67,69], a relation between the number of assignments completed and an increase in CT skills [44,60], increased awareness of using CT skills [37,41], and evidence of CT skills through an investigation of programming concepts used in Scratch [23]. Studies also describe improved understanding of CT [13,17,20,31,47,50,73,74], and conclude that the attitude towards CT was improved by the intervention [47,57,59,64,73,74].…”