As a promoter of information fluency, I'd argue that it is a 21st century foundation skill for all core academic subjects.
To be information fluent means a student can independently research and evaluate digital information relevant to any topic, the common core academic subjects, as well as media studies and consumer issues.
Common Core has been critical of the idea that our children’s education should be organized around a set of so-called “21st century skills” instead of core academic subjects such as history, science, and the arts.
I am a life long educator. I won a Milken National Educator Award in 1995. The Milken Family Foundation introduced me to online education. After 25 years of classroom teaching I retired from k-12 education to pursue online teaching and instructional design full time. I have 39 years of teaching experience.