Improvements in bASES21: 21st-Century Skills Assessment Model to K12

Digital age has been impacted worldwide economy, human communication, knowledge access, democracy and days by day citizen lives. Consequently, several international entities make strategies for educational system and to empower people to labour market. One strategy has been to define what skills are important develop in 21st-century. To introduce educational systems approaches that aim to develop 21st-century skills it is necessary encompass how to teach, how to learn, and how to assess this personal development. Some practices have been indicated that teaching computing in basic education could act synergistically with 21stcentury skills learning. So that, bASES21 is an instrument created to assess such skills. The first version was tested with a group of 148 high school students. Statistical studies pointed out the need of expand the sample size. Then in a second study sample size reach 560 students. New statistical analyses were done, and it was proposed several changes in first model. The instrument upgraded can assess such skills with 56 questions instead of 82, that were originally taken. These results can be very useful to ensure to attain necessary reliability and validity and to make possible popularization in using this instrument in K12 school setting.