Benchmark 9B
The Mathematical World: Symbolic Relationships
Grades 9-12, page 220

Any mathematical model, graphic or algebraic, is limited in how well it can represent how the world works. The usefulness of a mathematical model for predicting may be limited by uncertainties in measurements, by neglect of some important influences, or by requiring too much computation.

See also the general discussion in Unifying Concepts and Processes: Evidence, models, and explanation.