Environment is a set of tools that support the design, implementation, testing, and maintenance phases of the system development life cycle

Reengineering is a process of revising application software using a CASE tool.

Class (object type) is a group of similar objects.

Object is a process that accesses an object.

Signal is an external view of an object that can be accessed by other objects.

Concept is a knowledge in an abstract format that can be used to guide a searching or reasoning process.

Domain is a possible problem space in which searching or reasoning techniques can be applied.

Graph base is a technique for grouping several sub-problems into a meta-problem.

Heuristics is a mathematical term for a space that is defined abstractly; generally, the subset of a solution space to be considered.