principles of accounts - Version 3.0 principles of accounts If everyone involved in the process of accounting followed their own system, or no system at all, there's be no way to truly tell whether a company was profitable or not. Most companies follow what are called generally accepted accounting principles, or GAAP, and there are huge tomes in libraries and bookstores devoted to just this one topic. Unless a company states otherwise, anyone reading a financial statement can make the assumption that company has used GAAP.