Succession planning is the process for identifying internal personnel to fill key leadership positions if needed.
Succession planning is a process for identifying and developing new leaders who can replace old leaders when they leave, retire or die. Succession planning increases the availability of experienced and capable employees that are prepared to assume these roles as they become available. Taken narrowly, "replacement planning" for key roles is the heart of succession planning.
In dictatorships, succession planning aims for continuity of leadership, preventing a chaotic power struggle by preventing a power vacuum.