The Science Frameworks from the National Science Council describes what it means to be proficient in science. This vision of proficiency aligns with a view of science as "both a body of knowledge and an evidence-based, model and theory building enterprise that continually extends, refines, and revises knowledge." This proficiency description presents three dimensions of science that is embodied in each science standard (http://www.nextgenscience.org/three-dimensions).
Three dimensions of NGSS (Next Generation Science Standards):
The practices describe the attitudes and behaviors that scientists engage in as explore and develop models and theories about the natural world. The practices also contain a key set of engineering practices that engineers utilize as they design and build models and systems.
Crosscutting concepts are broad themes that intersect all domains of the sciences and have applications. The CCCs offer a way of linking the different domains of science. They include: Patterns, similarity, and diversity; Cause and effect; Scale, proportion and quantity; Systems and system models; Energy and matter; Structure and function; Stability and change.