Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of Computer Sciences (NYSE: CSC) plunged as far as 15.1% overnight on very heavy trading.

So what: Second-quarter earnings were strong but sales looked weak, and management slashed full-year earnings and sales guidance based on this quarter's business trends. Blame Uncle Sam: "The Public Sector business continues to be affected by the Federal budget uncertainty."

Now what: The company competes with the likes of IBM (NYSE: IBM) Global Services, Hewlett-Packard (NYSE: HPQ) Enterprise Services, and Accenture (NYSE: ACN) in the hotly contested IT services sector. I suppose it would be unfair to expect great shakes from Computer Sciences at a time when even Big Blue isn't firing on all cylinders. That being said, Computer Sciences has earned the trust of your fellow Foolish investors and scored a perfect 5-out-of-5 CAPS stars. To learn more or even weigh in with your own views, just click here to swing over to Computer Sciences' CAPS page.

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