Evaluate a company is not a simple task. Every business has its variables and therefore can not make a generalization between them. Aspects such as group size, the amount of data available and the very purpose of the evaluation are responsible for this, not generalizability, considering thus the most important evaluation process that the actual product itself, i.e., the company. In this sense, the evaluation of a company that is setting is entirely different from a company that is already running, or that being settled.Among them, one can quote the buying situations and sale of business, feasibility studies of interest associations of the firm, legal expropriation, determination of shares, the merger of two or more companies and split-off or all of a company.There are three sources used for the evaluation of a company: the current financial statements, its true and competitors or the companys peer group.Contrary to what many may think, the fair value of a company is directly linked to the present and future benefits of cash it can generate, not by their physical and quantitative assets recorded in the accounts. In other words, the fair value of a company can not be determined by your wealth generated in the past, but for what it produces results today and that may generate in the future (projections).Whatever the situation involved the negotiation, the value of the company should always bebased on the ability to generate cash flows and the uncertainty associated with them.However, to reach a real or fair value for a company, the evaluator should make useof various methods used in the business evaluation. Each method depends on the situationpresented and the availability and reliability of the information obtained.