Science & Engineering Practices
The Science and Engineering Practices (SEP) are what students DO to make sense of phenomena. They are both a set of skills and a set of knowledge to be internalized. The SEPs reflect the major practices that scientists and engineers use to investigate the world and design and build systems.
Image from NextGen Inquiry.
Check out this overview of the science and engineering practices.
https://ngss.nsta.org/PracticesFull.aspx
To learn about the practices in more depth watch the series of 8 videos by Bozeman Science highlighting each of the practices.