Definitions for

**"Conceptual model"**A conceptual model consists of a set of assumptions that reduce the real problem and the real domain to simplified versions that are satisfactory in view of the modeling objectives and the associated management problem. The conceptual model serves as a basis for the mathematical one

A visual presentation of the proposed structure of the risk assessment model showing data needs, model outputs, and logical flow of the calculations.

A graphical model describing the system services in general terms as how they are related, their focus and entities.

a user's understanding of how what an application does and how it works

a representation of some phenomenon by logical and mathematical objects such as function s, relations, tables, stochastic process es, formulas, axiom systems, rules of inference etc

A depiction or representation of the most current understanding of the major ecosystem features and processes (including biological, physical, chemical and geomorphic components) of a particular environment (e.g. estuaries).

an explanation of what we know - or think we know - about aspects of the natural world