The goals of my IS department might be helpful to you in reviewing your own.
We have zero tolerance for unplanned down time. This is perhaps job # 1 for the department's delivery to the company.
This means if there is a hardware failure, it will be replaced repaired whatever immediately.
We do not have software failures, due to how we do testing of software changes, and our methods of implementing changes are such that if a scenario occurs that the testing did not anticipate, we canalways return to the old version of the software before the upgrade.
Diagnosing & repairing mess ups to our data base integrity is also part of this.
Security is another facet of this, but the statement of the goal is simple.
Another goal is to serve the end users of the company like they are customers. We are in business to serve our customers. Without the customers we are not in business.
Another goal is to provide high performance at all times. It is not tolerable for users tohave to be waiting on reports, or to have error messages on their screens that are non-understandable.
There are financial goals ... delivering on the other goals without costing the company any more money, so that IS serves to make the whole company more efficient without being a drain on the enterprise.
You have to set goals that are right for your company, make sure they agree with top management business plan, then structure the staff roles to implement the goals.