Jared wants to estimate the downtime that will result as part of a planned change. Which of the following methods will most effectively help him estimate downtime?

Organizations often perform changes in a test environment to allow accurate time estimates and to determine if there are issues with the change like undocumented dependencies or problems with patches. Average downtime is a poor indicator of what a specific change may require, a fixed maintenance window does not ensure the change will take that amount of time, and vendors rarely have a full understanding of the environment an organization is operating in.