Each weekday, TheStreet.com Ratings updates its ratings on the stocks it covers. The proprietary ratings model projects a stock's total return potential over a 12-month period, including both price appreciation and dividends. Buy, hold or sell ratings designate how the ratings group expects these stocks to perform against a general benchmark of the equities market and interest rates. While the ratings model is quantitative, it uses both subjective and objective elements. For instance, subjective elements include expected equities market returns, future interest rates, implied industry outlook and company earnings forecasts. Objective elements include volatility of past operating revenue, financial strength and company cash flows. Adobe Systems ( ADBE) offers business and mobile software and services worldwide. It has been upgraded to a buy from a hold. The company's revenue increased by 41.4% in the third quarter compared with the same period last year, outpacing the industry average of 18.4%. Revenue growth helped boost earnings per share by 112.5% over the same timeframe. Adobe has no debt to speak of, a relatively favorable sign, and maintains a quick ratio of 2.82, which demonstrates the ability to cover short-term cash needs. The company's stock price has increased by 14.16% over the past year, reflecting both its robust earnings growth and the market's overall trend. Adobe had been rated a hold since June 2007.