Warren Buffett's investment system is carefully studied by new investors. His methods are inspired by Graham's fundamental investing tactics outlined in his book "The Intelligent Investor". Buffett, through years of using and adjusting Graham’s rules, created a set of his own. The methodology focuses on determining what a particular company's shares are worth. There are a few factors which can alter to a company's value, included in that set are the past performance, amount of debt, and cash on hand. Warren lists six easy steps to determine the real value of all companies. To determine if a company has always performed well, the net income of the company must be divided by the capital that the shareholders are paid. In step two the investor must check the value of debt owned by the company. If the company has a large outstanding debt it becomes a risky investment. To calculate debt the total liabilities is divided by shareholder equity. Then the investor must focus his attention to the profit margin. Are the profits high in the sector and are they increasing more than other similar companies? To calculate this the net income is divided by net sales.