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IT can control IT purchases
Tell finance not to approve any IT purchases unless IT purchase is on a pre-approved list. This works if IT is responsive to non standard??purchase requests. I would suggest a SLA of IT replying to business within one week. Usually, IT can investigate product or service or find a better product or service within one week. Often, IT informs business that product or service already exists in-house but person making the request did not know about it.