I'm not sure if this is the right forum, so please excuse me if it is not.
I work as a senior sysadmin for a company serving 500-600 users and computers. I'm in a situation where we are implementing a range of system center and SQL solutions. I'm looking for the best arguments to convince my supervisor about the need for a test environment - specifically for system center.
The testing will be for general config and management changes. Some changes that cannot be tested in a production environment (which is where we test stuff today) e.g. configuration of items that are global in scope.
Counter arguments vary from "What is the point of testing? We should know what to do." to "We have snapshots and backup".
Among other things I'm trying to avoid using days restoring servers and (parts of) databases because some ones testing went wrong.
So i'd like to create a document with convincing arguments from reliable sources to hand to my supervisor.