A preventive control is a type of control that aims to avoid or reduce the occurrence of an undesirable event or risk. A preventive control can be implemented through technical, administrative, or physical means. A new policy that forbids copying of data onto removablemedia is an example of a preventive control, because it prevents unauthorized data exfiltration or leakage through removable devices, such as flash drives or external hard disk drives. A preventive control is different from the other types of controls, as explained below:

A detective control is a type of control that aims to discover or identify the occurrence of an undesirable event or risk. A detective control can be implemented through monitoring, auditing, or reporting activities. An example of a detective control is a log analysis tool that detects any unauthorized access or modification of data on a system.

A directive control is a type of control that aims to guide or instruct the behavior or actions of individuals or groups. A directive control can be implemented through policies, procedures, standards, or rules. An example of a directive control is a training program that teaches employees how to handle sensitive data securely and appropriately.

A deterrent control is a type of control that aims to discourage or dissuade individuals or groups from performing an undesirable event or risk. A deterrent control can be implemented throughsanctions, penalties, or consequences. An example of a deterrent control is a warning message that informs users of the legal implications of copying data onto removable media without authorization. References = Risk and Information Systems Control Study Manual, Chapter 2, Section 2.2.1, page 38.