er-3 switch. When you combine the two devices, you only need to have a maintenance contract on one, which might lower yearly maintenance costs. Why Change Control Is Your Friend If you've been working in a small company that's grown into a larger company, or you've moved from a smaller to a larger company, you've probably run into change control. Change control is the means whereby a company limits the changes that are made to the network (or anything, for that matter) until they are understood and scheduled. If you wanted to upgrade a router with change control active, you would need to submit a request. The request would then need to be approved, at which point the change might be scheduled. In some companies, a single person approves or denies change requests. In other companies, committees review every request. I've seen companies where the change-control committee only meets on, say, Tuesdays. If your change is denied, you have to wait until the next Tuesday for an alternative change to be considered. Scheduling changes seems to be one of those things that make engineers a bit nutty. Why should you have to wait for a team of people who don't understand what you're doing to tell you it's OK to do it? Why waste time if you know you can fix a problem with a single command that won't hurt anything? To engineers, change con- trol can seem like a waste of time and energy that does nothing but interfere with their ability to get work done. Over the years, I've held many positions, ranging from junior engineer to director of a large consulting company to running my own business. During those years, I've learned a few things about how businesses operate and how engineers think. Run- ning a business while also being an engineer has given me a unique insight into both worlds. Why Change Control Is Your Friend Change control is important for any company for the simple reason that failures cost money. Take a large e-commerce web site, for example. If an engineer makes a change that causes the site to become unavailable, 