Before revision: The reason for such a condition is apparent when one recognizes that any system, if it is to achieve a predetermined goal, must have available to it at all times an indication of its degree of attainment.
After revision: The reason for such a condition is apparent wheФУИЭn one recognizes that any system, if it is to achieve a predetermined goal, must have available to it at all times an indication of its degree of attainment.