Here at Zacks, we focus on our proven ranking system, which places an emphasis on earnings estimates and estimate revisions, to find winning stocks. But we also understand that investors develop their own strategies, so we are constantly looking at the latest trends in value, growth, and momentum to find strong companies for our readers.Considering these trends, value investing is clearly one of the most preferred ways to find strong stocks in any type of market. Value investors use tried-and-true metrics and fundamental analysis to find companies that they believe are undervalued at their current share price levels.Luckily, Zacks has developed its own Style Scores system in an effort to find stocks with specific traits. Value investors will be interested in the system's "Value" category. Stocks with both "A" grades in the Value category and high Zacks Ranks are among the strongest value stocks on the market right now.One stock to keep an eye on is KB Home (KBH). KBH is currently sporting a Zacks Rank of #2 (Buy), as well as an A grade for Value. The stock is trading with a P/E ratio of 7.81, which compares to its industry's average of 11.44. Over the past 52 weeks, KBH's Forward P/E has been as high as 12.47 and as low as 2.96, with a median of 9.03.Value investors also use the P/S ratio. The P/S ratio is is calculated as price divided by sales. This is a prefered metric because revenue can't really be manipulated, so sales are often a truer performance indicator. KBH has a P/S ratio of 0.93. This compares to its industry's average P/S of 0.95.Value investors will likely look at more than just these metrics, but the above data helps show that KB Home is likely undervalued currently. And when considering the strength of its earnings outlook, KBH sticks out at as one of the market's strongest value stocks.Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report KB Home (KBH): Free Stock Analysis Report To read this article on Zacks.com click here.