Controls can be designed for various functions. Some controls can be installed to prevent undesirable outcomes before they happen (preventive controls). Others controls can be installed to identify the undesirable outcomes when they do happen (detective controls). Still other controls can be installed to make sure that corrective action is taken to reverse undesirable outcomes or to see that they do not recur (corrective controls). All of these types of controls, in concert, function to ensure that some department/university objective or goal will be met.
Preventive Controls are more cost-effective than detective controls and are designed to discourage errors and irregularities from occurring. When built into a process, preventive controls forestall errors and thereby avoid the cost of correction.
Examples of preventive controls include: trustworthy, competent staff; segregation of duties to prevent intentional wrongdoing; proper authorization to prevent improper use of university resources; adequate documentation and records as well as proper record-keeping procedures to deter improper transactions; and physical control over cash, equipment and other assets to prevent their improper conversion or use.
Detective Controls are usually more expensive than preventive controls, but are also essential, and are designed to find errors or irregularities after they have occurred. Detective controls measure the effectiveness of preventive controls. Also, some errors cannot be effectively controlled through a system of prevention; they must be detected when they occur.
Examples include reviewing procurement card statements and phone charges for appropriateness, allowability, and/or proper allocation. Detective controls also include such control devices as bank reconciliations, independent checks on performance, confirmation of bank balances, cash counts, and systems of review like internal auditing.
Corrective controls come into play when improper outcomes occur and are detected. All the detective controls in the world are valueless if the identified deficiency remains uncorrected or is permitted to recur. Corrective controls such as documentation and reporting systems keep problems under management surveillance until they have been solved or the defect corrected. Corrective controls thus close the loop that starts with prevention and passes through detection to correction.