The RVS Group (1995-2017) was the research group of Peter Ladkin (PBL) at Bielefeld University. 

The RVS Group's specialities lay in:

• Failure analysis and accident analysis: in particular Why-Because Analysis
• System safety analysis and forward engineering: in particular Bielefeld Ontological Analysis and Ontological Hazard Analysis
• Systems and software reliability
• Logic and applications

PBL formally retired from Bielefeld University in February 2017, and continues actively to publish. 

The archived RVS site at the domain rvs.uni-bielefeld.de is no longer offered at the Bielefeld University Faculty of Technology. It is available at the Wayback Machine at https://web.archive.org/web/20250514151106/http://rvs.uni-bielefeld.de/

PBL has been active in electrotechnical standardisation since 2010, with the German organisation DKE and with the International Electrotechnical Commission (IEC), in the areas of system safety, reliability, and electrotechnical terminology. 

RVS publications, as well as PBLs publications of record dating from 1986 to 2017, are available here at publications/

PBL publications from 2017 onwards are available here at  PBLrecentPublications/

The WBA Home Page is available here at  research/WBA/  (Unfortunately, those links which refer to slidesets in the Bieleschweig Workshop series do not currently work. We are working to restore these resources.)

The Compendium of Computer-Related Incidents with Commercial Aircraft, maintained until 2007, is available here at publications/compendium/ (We ceased maintenance in 2007, as the tech-transfer company Causalis began to advise clients on the causal analysis of accidents.)