Identify a first change to a first portion of the system, and identifying at least a second portion of the system that is, at least in part, dependent on the first portion. At least one user who is assigned responsibility for maintaining the first portion or the second portion of the system can be identified, and an availability of the user to maintain the first portion or the second portion of the system during a time period can be determined. The time period can begin when the first change is initially scheduled for introduction into the system. Responsive to determining that the user is not sufficiently available to maintain the first portion or the second portion of the system during the time period, the first change can be prevented from being introduced into the system as initially scheduled for introduction into the system.