2Steve Olson, Jay Labov. STEM Learning is Everywhere: Summary of a Convocation on Building Learning Systems[EB/OL].the National Academies Press, Washington, D.C.http://www.nap.edu/catalog.php?record_id=18818, p.2-3; p.3; p.42; p.4;p.;pA9-55.
3OECD.PISA 2012 Results in Focus[EB/OL].http://www.oecd.org/pisa/keyondings/pisa-2012-results-overview.pdf.
4The LIFE Center. Learning in and out of school in diverse environment[EB/OL].http://www.life-slc.org/docs/Banks_etal-LIFE-Diversity- Report.pdf, p.9.
5Kathleen TraphagenandSaskiaTraill. How Cross-Sector Collaborations are Advancing STEM Learning[EB/OL].http://www.samueli.org/ stemconference/documents/STEM%20Learning%20Ecosystems.pdf, p. 13-17;p. 18-27;p.28-29.
6Bevan, B. (2011).Strong Pre-College Experiences Linked to Later Notable Achievements in STEM: An ISE Research Brief Discussing Wai et al.'s, "Accomplishment in Science, Technology, Engineering, and Mathematics (STEM) and its Relation to STEM Educational Dosage[EB/OL].http://www.relatingresearchtopractice.org/article/178.
7The 6,000-Hour Learning GAP.The Mter-School Corporation. www.exandedschools.org; Friedman, L.N. Education Week, December 11, 2013. How a Learning Gap Grows[EB/OL].http://www.edweek.org/ew/articles/2013/12/11l14friedman.h33.html.
8Voss, A.S.(2011).Cross-cntextual Learning: Redesigning the Interactions of Informal and Formal Contexts for Conceptual Change[M]. Capstone: Peabody College, Vanderbilt University, p.17-18.
9Next Generation Science Standards, Appendix A Conceptual Shifts in NGSS, p.3. April 2013[EB/OL].http://www.nextgenscience.org/ si tes/ngss/files/A ppe ndix % 20 A % 20-% 204.11.13 % 20Conceptual % 20Shifts% 20in% 20the% 20 Next% 20Generation % 20Science% 20Standards.pdf.
10Next Generation Science Standards, Front Matter, p.2. April 2013 [EB/OL].http://www.nextgenscience.org/sites/ngss/files/Final% 20Release%20NGSS%20Front%20Matter%20-%206.17.13%2011pdate_0.pdf.
