Human beings, by and large, are resistant to change. In a lot of ways, we can't help it — science has revealed that it's literally a part of our evolution. Generally speaking, the brain doesn't like uncertainty because anything uncertain is instinctively perceived as a potential threat. This is certainly true in our personal lives, where even something as seemingly simple as buying a new car can become an overly long and involved process. But it is especially true in our professional lives when you're talking about the technological foundation that is at the heart of any modern day business.