From the perspective of accounting information system, documentation is defining the transaction by means of parties, date, subject, quantity and amount. For example, think of an invoice. Invoice is a document that indicates a sales transaction has been made. It shows the parties (buyer and seller) involved in the transaction. It shows the date of the transaction. It shows the subject (for example the company sold laptop computers) of the transaction. It shows the amount(for example, 15 laptop computers) of the transaction and lastly it shows the amount(15x3.000T=45.000T + VAT) of the transaction.