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If a company wants to update their systems like for example ERP or CRM or a bookkeeping system etc. How can they best do this.. Just update the systems on every computer and hoping it works 100%? Or test it on 1 computer?

Are there best practises for this? Or even how is this called in the IT world? Is it ITIL ?

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I would expect a release management cycle based on DTAP.

Users should try the new versions in an acceptance environment and then maybe start upgrading only a couple of users in production to find major issues not found in acceptance.

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