The proven Zacks Rank system focuses on earnings estimates and estimate revisions to find winning stocks. Nevertheless, we know that our readers all have their own perspectives, so we are always looking at the latest trends in value, growth, and momentum to find strong picks.Looking at the history of these trends, perhaps none is more beloved than value investing. This strategy simply looks to identify companies that are being undervalued by the broader market. Value investors use a variety of methods, including tried-and-true valuation metrics, to find these stocks.On top of the Zacks Rank, investors can also look at our innovative Style Scores system to find stocks with specific traits. For example, value investors will want to focus on the "Value" category. Stocks with high Zacks Ranks and "A" grades for Value will be some of the highest-quality value stocks on the market today.One stock to keep an eye on is General Motors Company (GM). GM is currently sporting a Zacks Rank of #1 (Strong Buy), as well as a Value grade of A.We also note that GM holds a PEG ratio of 0.87. This popular figure is similar to the widely-used P/E ratio, but the PEG ratio also considers a company's expected EPS growth rate. GM's PEG compares to its industry's average PEG of 1.78. GM's PEG has been as high as 1.17 and as low as 0.71, with a median of 0.90, all within the past year.Value investors also frequently use the P/S ratio. This metric is found by dividing a stock's price with the company's revenue. This is a popular metric because sales are harder to manipulate on an income statement, so they are often considered a better performance indicator. GM has a P/S ratio of 0.66. This compares to its industry's average P/S of 1.58.These are only a few of the key metrics included in General Motors Company's strong Value grade, but they help show that the stock is likely undervalued right now. When factoring in the strength of its earnings outlook, GM looks like an impressive value stock at the moment. 5 Stocks Set to Double Each was hand-picked by a Zacks expert as the #1 favorite stock to gain +100% or more in 2021. Each comes from a different sector and has unique qualities and catalysts that could fuel exceptional growth. Most of the stocks in this report are flying under Wall Street radar, which provides a great opportunity to get in on the ground floor. Today, See These 5 Potential Home Runs >>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 General Motors Company (GM): Free Stock Analysis Report To read this article on Zacks.com click here.