And he committed himself in the coming weeks to taking steps that use the power of his office to help try to bring about changes that will address this problem, recognizing the complexity of the problem and the obstacles to potential solutions to the problem.

WHITEHOUSE: Press Briefing by Press Secretary Jay Carney,

The main problem is that the complexity of computer networks makes it very difficult to quantify risk accurately.

ECONOMIST: Putting it all together

The problem has been the sheer complexity of the data and the ensuing processing and analysis of the information.

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But the biggest problem may be the sheer complexity of doing ad campaigns that can reach consumers who increasingly flit from computer to smartphone to tablet and back throughout the day.

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He's been telling reporters his views at the Pentagon, and you get a sense of the complexity of the situation when you hear how Petraeus starts with the problem, offers some optimism, but then qualifies it all with what's still going wrong.

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Few would argue that the enormous complexity of the gargantuan US Federal Government is a huge and dangerously expensive problem.

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One way to cut through the complexity is to look at a relatively small and tractable subset of the larger problem.

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They are concerned about the cost and the complexity of the system, and they should be concerned because that is still going to be a problem.

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