SYSTEM CONTROL

A technique for controlling system critical changes implementable by a user of an operating system comprises receiving a request from the user to make a system critical change and assessing whether the user has appropriate privileges to make the system critical change. If the user has appropriate privileges to make the system critical change, then notifying at least one further user having the appropriate privileges to make the system critical change of the received request and awaiting approval from at least one further user before implementing the requested system critical change. Aspects and embodiments improve security of a computer system by removing a single user's capability to directly issue and have implemented dangerous or disruptive commands.