- [Extensibility is core](http://www.openpetra.org/organisation-benefits)
- Ledger-specific access control, three access levels.
- using fixed point arithmetic: System.Decimal data type for all money related variables (changed from Double to Decimal in end of 2010: [commit](https://github.com/openpetra/openpetra/commit/a1717237825a6c8f0d5e032c843241ed918e2344))
### Negative
- In BETA state, presently used by at least two organizations, one for accounting, one for contact management.
- [Decreasing Y-O-Y commits](http://www.ohloh.net/p/openpetraorg) <pre>2013-11-13 16:10:00 christiank joar: I have checked for the source of increased commits in January 2011: It is a mixture of a huge bug-fixing spree and the result of a merge-into-trunk of a Sideline Branch, which then still needed more development</pre>