FlexBooks can be designed to suit a learner's learning style, region, language, or level of skill, while adhering to the local education standards.
Anyone – including teachers, students, and parents – can adapt, create, and configure a FlexBook.
[2] Some FlexBooks features include: Each CK-12 FlexBook is created under Creative Commons Attribution-Non-Commercial 3.0 Unported (CC BY-NC 3.0) License,[4] giving its author/user a right to share (i.e., right to copy, distribute and transmit the work) a right to remix (i.e., right to adapt the work).
In March 2009, FlexBook was acknowledged as “an adaptive, web-based set of instructional materials” by Virginia officials when members from Virginia's K-12 physics community along with university and industry volunteers developed an eleven chapter FlexBook titled “21st Century Physics FlexBook: A Compilation of Contemporary and Modern Technologies” in just 4 months.
[5] In September 2010, NASA teamed up with CK-12 to add a chapter on “modeling and simulation” to the existing Physics FlexBook created earlier.