Commercial RDR Systems

Pacific Knowledge Systems  

PKS RDR are used to provide clinical interpretations of chemical pathology reports to guide GPs in their patient management, further test ordering and so on.  To date about 30 million patient reports have been processed by Labwizard, PKS’s RDR system (Lindsay Peters, personal communication).  About 100 knowledge bases have been built by 14 chemical pathology laboratories (Lindsay Peters, personal communication).  A more detailed report on use of RDR by one pathology company has been published (Compton, Peters et al. 2006).  Pathologists in this company had developed over 16,000 rules.  A particularly important result from this study was the industrial demonstration that the cost of adding a rule was very short, on average about one minute of expert time, and was close to independent of knowledge-base size even with knowledge bases of thousands of rules.  

 PKS commissioned a report from IRIS research to survey the GP’s using a particular laboratory services shortly after the introduction of Labwizard the RDR tool.  The GPs note improved patient outcomes because of the improved reports.  Compton, Peters et al. 2006 also shows that more knowledge bases were added over time despite this resulting in increased costs to the laboratory because of a per-usage charging model.  Presumably this only occurred because the pathology companies thought that the improved reports were likely to increase the GP requests directed towards their pathology service.  

(Note: I have a small shareholding in PKS)

Ivis, the world’s largest on-line grocer with a turnover exceeding $2B.  uses an RDR system (Sonetto) developed by Ivis  (Sarraf and Ellis 2006); see also a presentation on Sonetto.  Apparently, Tesco business analysts have developed 100s of 1000s of RDR rules used mainly for ensuring appropriate information about products appears on affiliate sites (e.g. Kelkoo) and in suggesting products to customers.  Ivis Sonnetto product has won two Microsoft Awards, including one for innovation.  See also .


The core system that Erudine offers, seems from one of its whitepapers, to be identical to RDR; however it does not refer RDR.  This may have been an independent development, but there may be commercial reasons for lack of reference to RDR, as Erudine was previously known as Rippledown Solutions suggesting a closer connection.  The Erudine website suggests a range of interesting applications, particularly in re-engineering legacy systems.  The legacy system provides a stream of cases that are used to create the new system.

Yawl Group

The Yawl Group  provides consultancy and training services for companies developing business process management, particularly through the use of the YAWL workflow management system.  YAWL uses RDR as a core component of its workflow management system.  


Ucube is an  professional services company that offers a Ripple-Down Rule engine product amongst other products.  


Sricom a consulting company that provides a range of services in IT systems consulting.  It provides an RDR-based tool for developing pro forma applications .  


KMagent is University of Tasmania spin-off that use RDR for document management and information retrieval from dynamic web pages.  It is based on the work of Byeong Kang and his group.  Byeong has also been involved in introducing RDR to a number of Korean companies.


There is a range of other industrial commercial underway with various large commercial partners, including other medical applications, business processes, and managing email

Machine Learning

There has been a range of machine learning research by various groups using one of the RDR representations.  WEKA provides the RIDOR RDR learner.  The is a classic batch processing supervised learner, but with an RDR representation