Written, verbal presentations can be used to interpret and expand more abstract mathematical concepts. Prior knowledge provides a foundation for new learning experiences. Human beings learn complicated concepts from others through various methods of communcation. Models are often used to represent concepts of various magnitudes. The usefulness of a graph or drawing is determined by the scale utilized.
Specialized structures perform specific functions.
All objects in the universe are affected by the gravitational forces. Any change or error in design may affect function. Design usually requires taking constraints into account. Estimation of probability can be based on data from similar conditions in the past or what is known about current situations. An investigator's credibility depends upon accurate record keeping, openness, and replication.