Change control makes sure every change to scope, design or requirements is requested, assessed for its impact, approved by the right person and recorded before it's done. 'Just add it to the model' is a change too.
Projects change: clients rethink, sites surprise, products become unavailable. Change control doesn't stop change; it makes sure every change is requested, assessed, approved and recorded before anyone does the work, so everyone knows what changed, why, and what it costs.
Route them through the same process as design changes.
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