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### Design Statement

A part of design brief that challenges the designer, describes what a design solution should do without describing how to solve the problem, and identifies the degree to which the solution must be executed.

### Geometric Constraint

Constant, non-numerical relationships between the parts of a geometric figure. Examples include parallelism, perpendicularity, and concentricity.

### Scale Model

A model of an object in which the dimensions are in proportion to the actual dimensions of the object.

### Two-Dimensional

Having the dimensions of height and width, height and depth, or width and depth only.

### Computer-Aided Drafting

the use of computers, software, and associated hardware for the production of graphic drawings

### Design Brief

A written plan that identifies a problem to be solved, its criteria, and its constraints. The design brief is used to encourage thinking of all aspects of a problem before attempting a solution.

### Mock-Up

Also referred to as an Appearance Model. A model or replica of a machine or structure for instructional or experimental purposes.

### Numeric Constraint

A number value, or algebraic equation that is used to control the size or location of a geometric figure.

### Solid Modeling

A type of 3D CAD modeling that represents the volume of an object, not just its lines and surfaces. This allows for analysis of the object's mass properties.

### Three-Demensional

a figure whose points do not all lie in a single plane EX: cube, pyramid, sphere...