Change management is a valuable tool that mature sites use to increase the
reliability of the site, both through restricting when certain changes can happen
and by having a process for reviewing changes in advance to catch any
adverse effects the SA may have missed or interactions that the SA might not
have known about. Change management also helps with debugging problems,
because changes are tracked and can be reviewed when a problem
arises.
The frequency with which you have change-management meetings depends
on their scope and how rapidly the environment that they cover
changes. Instituting a mechanism through which SAs check that the site is
operating normally before they make their changes reduces the risk that a
change made during debugging of an existing problem complicates the debugging
process or makes the site even less stable.