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 Corp. (NYSE: CSC) plunged 14.5% in intraday trading today after the company reported earnings and lowered guidance for the current quarter.

So what: Reported EPS of $1.54 beat the consensus estimate of $1.48. However, "sluggish" contract signings in the North American public sector led the company to lower EPS guidance for the fiscal year (with just the current quarter to go) to $5.20 versus a consensus estimate of $5.39.  

Now what: Because $3.64 of EPS is already in the bag year-to-date, the estimate for the current quarter is likely to drop from $1.81 to around $1.56. With government spending under pressure, the weakness could continue for an extended period, and earnings estimates beyond the current quarter are likely too high. A P/E ratio of 11.1 with a 1.4% dividend yield may seem attractive, but investors might be better off waiting for the news flow to turn positive before jumping into the stock.

Interested in more info on Computer Sciences Corp.? Add it to your watchlist here by clicking here.