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Elements of a System. (1) Goal; main purpose/objective of the whole system. (2) Process; how the goal is achieved. (3) Environment; where the system works and develops. (4) Observable Interactions (Input and Output); data/information with which the system works. (5) Control Mechanisms; how the system regulates itself. (6) Subsystem; elements that are systems by themselves.

Data Type is the way in which objects are represented in a computer.

There are three types of Data Types: (1) Numeric: integer, real (float and double), longint (2) Logic: Boolean (Trues and False) (3) Characters: char, string

Variables are the values that change during the execution of the program.