There are many 3rd Party recovery programs are available under Linux / Windows to recover the deleted files from any operating systems.
I would like to show you how we can recover deleted files using command line tool developed by United States Air Force Office of Special Investigations and The Center for Information Systems Security Studies and Research.
Foremost is a console program to recover files based on their headers, footers, and internal data structures. This process is commonly referred to as data carving. Foremost can work on image files, such as those generated by dd, Safeback, Encase, etc, or directly on a drive. The headers and footers can be specified by a configuration file or you can use command line switches to specify built-in file types. These built-in types look at the data structures of a given file format allowing for a more reliable and faster recovery.
Role and responsibility model of the OpenERP is great and powerful features, It becoming mature day by day.
In the version 5.0 they come up with the idea to define the predefined groups, roles and responsibilities.
In the version 6.0 they did lots of improvements like replace the roles with the groups, so it was a very very easy to working with only one system rather then working with the groups and roles separately. In the version 6.1 they plan to improve a lot in terms of the usability and simplicity.