A necessary consideration in the development or expansion of courses incorporating techniques such as geographic information systems (GIS) is the establishment of the infrastructure to support such instruction. Planning for the practical application of knowledge involves the determination of hardware, software, data and personnel needs.
Continuity: the tendency to perceive things as simply as possible with a continuous pattern rather than with a complex, broken-up pattern o Contiguity: the tendency to perceive 2 things that happen close together in time as being related Rods and cones, which one is less or more light/color sensitive?
Slow process of change from one form or level to a better or higher one, or that brings into being a superior or new order. Evolution does not occur in a straight, steady progression but is marked by false starts and dead ends, random leaps in different directions, and long periods of no fruitful activity. And, contrary to the popular belief, constant adaptation (see natural selection) is not the main feature of evolution. By far the most dominant evolutionary phenomenon is the preservation of whatever is working well.