Immediately after a person who has been sentenced to 90 days or more of imprisonment is received at any institution under the jurisdiction of the Department, a classification committee shall obtain and file complete information with regard to such person. Similar records may be compiled on persons sentenced to less than 90 days, in accordance with rules and regulations of the Department. When all such existing available records have been assembled, each such classification committee shall determine whether or not any further investigation is necessary, and, if so, it shall make such additional investigation. Each classification committee shall determine and prescribe the custodial and rehabilitation program and the care for each person coming under its jurisdiction. The classification committee shall determine the persons who shall work and labor and shall assign persons to jobs, studies and programs according to their abilities and in the manner best calculated to effectuate their training and rehabilitation. Review for reclassification shall occur periodically in accordance with the Department's regulations, or whenever the committee shall deem it advisable.