The basis of an operation system is the connection among operands and operators. The connection state is specified sequentially by instruction codes, which is called control driven. The next connection state is generated by the result of the operation, which is called reaction driven. The operation start when the operands change, which is called data/event driven. The operation including connection changing for the formula automatically solving start when any operand is unknown, which is called goal driven. Reaction driven is data/event driven and goal driven too, but control driven is not.
