Foreword for the First Edition
We are drowning in complexity. Much of it is incidental—arising from the way we are solving problems, instead of the problems themselves. Object-oriented programming seems easy, but the programs it yields can often be complex webs of interconnected mutable objects. A single method call on a single object can cause a cascade of change throughout the object graph. Understanding what is going to happen when, how things got into the state they did, and how to get them back into that state in order to try to fix a bug are all very complex. Add concurrency to the mix, and it can quickly become unmanageable. We throw mock objects and test suites at our programs but too often fail to question our tools and programming models. ...
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