DOUBLE ENTRY SYSTEM , BOOKS OF PRIME ENTRY, SUBSIDIARY BOOKS: What is double entry system ? In 1494, Luca Pacioli the Italian mathematician first published his comprehensive treatise on the principles of the Double Entry System. The use of the principles of the double entry system made it possible to record not only cash but also all sorts of Mercantile transactions. Click on to Read More... Books of Prime Entry Or Books of Original Entry:- What is Journal in Accounting? A Journal in Accounting is often referred to as a book of prime entry or a book of original entry . In this book, transactions are recorded in their chronological order. The process of recording transactions in a Journal in Accounting is called 'journalization'. The entry made in books of prime entry or books of original entry is called the 'journal entry'. Entries in a Journal in Accounting are used to create a general account that is then used to cr...