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?
The theory of social continuity shows that. without this, the old continuities will necessarily tend to pull things back to the past. What constitutes a discontinuity? A social system cannot start absolutely without any continuity. Continuity of place is always there, unless the country is not only newly settled but was previously uninhabited.