VisiRule Expert System Demos


  This page features various VisiRule expert system demos which show some of the more advanced and versatile aspects of VisiRule such as database access, date capture and manipulation, and HTML integration. There are other demos available which deal with industry specific challenges such as Legal Problem Solving, Financial Problem Solving and Machine Diagnostics. As the software has its roots in, and access to, Prolog - the world's foremost logic programming language, there is really no limit as to what can be implemented. In addition, there is a dedicated Business Rules expert systems language, Flex, which enable customized rules to be supplied.


Advanced Features in VisiRule

Advanced Features of VisiRule

  • Meta-level Reasoning: VisiRule can use meta-level charts to control the execution of other VisiRule charts

  • Non-determinism: VisiRule can backtrack to find alternate solutions

  • Structural Decomposition: VisiRule Expression Logic can be split up and presented visually

Advanced Benefits of VisiRule

  • VisiRule can implement various sophisticated scoring schemes for evaluating answers

  • VisiRule can use different advice templates to produce bespoke reports

  • VisiRule Expression Logic can combine previous answers using logical operators.

Advanced I/O Features of VisiRule

  • VisiRule can read/write files in a wide variety of formats including CSV, XML, Json

  • VisiRule can access data in SQL databases using ODBC

  • VisiRule can access data in NoSQL databases like Redis using sockets


Classical Expert System to choose correct solvent -- uses AND and OR and structured logical expressions

Database Demo

Country Database Demo

Country Database

This demo uses an external database to let you pick a country, a district in that country and a city in that district. It then shows the population for that city before advising whether you should visit based on some subjective answers to misc questions.

Policy Risk Assessment

Check Dates

Uses a date picker to select 2 dates and make some calculations based on the dates chosen.

Teacher Timetable

Create a timetable for teachers who can only teach according to certain restrictions such as freetime, and subject competence. Demonstrates how to combine VisiRule Q&A with Flex forward-chaining rules for planning and scheduling.

Vroom Vetton Model

The Vroom-Yetton model is designed to help identify the best decision-making approach and leadership style to take, based on the current situation. It was originally developed by Victor Vroom and Philip Yetton in their 1973 book, "Leadership and Decision Making."


A demo which showcases how to use HTML in a chart to configure the display of questions and answers on the web pages .

security audit expert system


Security Questionnaire

A simple demo which shows how to evaluate answers for multi-answer questions to produce scores

Checks to see if you have certain documented policies in place - generates custom advice and produces a calculated risk score using scoring weights.
Also captures additional User Text Input.

These can be adjusted to illustrate dynamic scoring.

Fuzzy Logic Demo

A simple fuzzy logic demo showing how much tip to leave in a restaurant.

You can read about the background here.

Medical Speciality

Medical stereotypes are a well known, ranging from the hippy-esque GP, to the man-mountain of an orthopaedic surgeon, via the suave and sophisticated plastic surgeon.

Toby Hillman's explores this with his light-hearted flowchart "Did you choose them, or did they choose you?"

Natural Completion

A demo which shows how to complete a well using Natural Completion. Based on the work in:"Choosing a Perforation Strategy"

Holiday Selector

A simple demo which helps advise on where to go for a holiday.