## Theory: A broad coherent assembly of systematic explanatory schemes, consisting of laws, principles, theorems and hypotheses. They should be explicit (not based on interpretation or intuition), abstract (not referring to concrete example), and universal (valid in every place and at anytime)

## Law: A generalisation founded on empirical evidence, well established and widely accepted over a long period of time.

## A principle: A generalisation founded on empirical evidence but not yet qualifying for the status of a law.

## A theorem: A generalisation proven in a formal mathematical, logical way.

## A Hypothesis: A proposition which is intuitively and empirically considered to be true.

## A axiom: Impossible to prove or deduce from something else, but is a starting point for the hierarchy of scientific abstractions .

## A model: A link between theory and reality. To use a model is to visualise a theory or part of it. Models are commonly classified as iconic, analogue, symbolic, verbal and conceptual.

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