A comprehensive security plan cannot be executed instantly. The security plan includes a timetable that shows how and when the elements of the plan will be performed. These dates also set milestones so that management can track the progress of implementation.

It may be desirable to implement the security practices over time. For example, if the controls are expensive or complicated, they may be acquired and implemented gradually. Similarly, procedural controls may require staff training to ensure that everyone understands and accepts the reason for the control. The plan should specify the order in which the controls are to be implemented so that the most serious exposures are covered as soon as possible.

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Furthermore, the plan must be extensible. Conditions will change: New equipment will be acquired, new degrees and modes of connectivity will be requested, and new threats will be identified. The plan must include a procedure for change and growth, so that the security aspects of changes are considered as a part of preparing for the change, not for adding security after the change has been made. The plan should also contain a schedule for periodic review. Even though there may have been no obvious, major growth, most organizations experience modest change every day. At some point the cumulative impact of the change is enough to require that the plan be modified.