" If it’s not core, change it!

Once you are clear about the core ideology, you should feel free to change absolutely anything that is not part of it. From then on, whenever someone says something should not change because “it’s part of our culture” or “we’ve always done it that way” or any such excuse, mention this simple rule: If it’s not core, it’s up for change. The strong version of the rule is, If it’s not core, change it! Articulating core ideology is just a starting point, however. You also must determine what type of progress you want to stimulate. "

― James C. Collins , HBR's 10 Must Reads on Strategy (including featured article “What Is Strategy?” by Michael E. Porter)