A close eye on vendor responsiveness.

Through our company’s recent strategic planning session, I was given the reponsibility of managing IT resources. I very quickly realized that some of my IT vendors have been slacking. I created a log to track when the problem was reported, by whom, how long it took to repair, etc. What a wake-up call. Now I am wondering if my log is sufficient. Does anyone else have a log to track vendor IT repairs and requests that they would be interested in sharing? Or, am I entirely go the wrong direction by taking of my time to ensure their production?