Basic Bookkeeping for Windows - Version 5.02 OWL Basic Bookkeeping (BBK) for Windows v5.0. Very easy to use single entry accounting system for small businesses and individuals. BBK is Easy-to-Learn. The single entry system is highly intuitive and avoids financial jargon so you don't need to be an accountant to use BBK. BBK is Fast-to-Use. BBK lets you track your income and expenses in much less time than double entry systems. Users have reported time savings of up to 80% when switching from a double entry system. BBK gives you instant access to a variety of income, expense, profit, and general ledger reports with support for up to 1000 expense accounts. Income and expenses can be separated into folder to track multiple businesses or divisions within a business. The report generator lets you build reports using income and expenses from any one folder or a combination of folders. An import option in BBK links the program to OWL's Sales Management program (OASIS). Using BBK and OASIS together provides a comprehensive solution for invoicing, billing, customers, sales, receivables and general accounting.