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 model that defines the types of entities or objects that are of interest in a system or domain, and the relationships between them.

a data model which formalizes the representation and manipulation of concepts and relationships

a first step towards formalizing models by capturing their ideas on media such as paper or computer software

a human activity model that strictly conforms to the root definition using the minimum set of activities

a simplified description of the physical components and interaction of the surface- and ground-water systems

a simplified, high-level representation of the site to be modeled

An interpretation or working description of the characteristics and dynamics of a physical system.

1 : a global view of the enterprise. 2 : a model of entities and their relationships within a database that describes and represents global views.