Explanation
Problem management is focused on identifying and mitigating known problems and deficiencies before they are able to occur, as well as on minimizing the impact of incidents that cannot be prevented. Continuity management (or business continuity management) is focused on planning for the successful restoration of systems or services after an unexpected outage, incident, or disaster. Availability management is focused on making sure system resources, processes, personnel, and toolsets are properly allocated and secured to meet SLA requirements. Configuration management tracks and maintains detailed information about all IT components within an organization.

Security should be included in discussions from the very first phase when defining the scope.
Adding security later is likely to incur additional costs in time and money, or will result in an incomplete or inadequate plan.