Our journey began 8 years ago.

Since then, we have actively maintained and developed this product, listened to customer feedback, and improved it with every release.

130 bugs solved
86 features implemented
3 interfaces improved
68 product releases since 2018
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The journey, chapter by chapter.

68 releases are consolidated into 5 major-version chapters, covering 219 recorded improvements.

Major version chapter Latest generation

v6.0 - v6.1.22

Rational Will 6.0-6.1.22: Faster modeling, stronger reporting, and reliability

This chapter expanded decision-analysis workflows with group AHP, a Markov-model creation wizard, and an additional AHP priority calculation method. Later optimization accelerated complex Bayesian Network calculations. Maintenance releases concentrated on preventing crashes, protecting model validity, improving project loading, and ensuring reports print with the selected orientation.

5 features 24 bug fixes 1 interface change

Major features 5

  1. Added Group Decision Making for the Analytic Hierarchy Process and the Largest Eigenvector method for calculating AHP priorities.
  2. Added a wizard-based interface for creating Markov models, while improving the Number criterion and Utility Function Editor experience on small monitors.
  3. Improved the calculation algorithm so Bayesian Networks with complex structures calculate very fast.

Bugs and reliability 24

  1. Improved stability by addressing Bayesian Network freezes and multiple crashes affecting Decision Tree Analysis, AHP, shared views, and related application components.
  2. Strengthened cost-effectiveness and model safeguards: DALY use now requires an interest rate and prevents discounting from being turned off; corrected the Cost Effectiveness Plane chart.
  3. Resolved workflow and reporting problems, including AHP PDF/Excel reporting with zero or one option, project-setting reset issues, JSON special-character failures, and report page orientation.
  4. Projects containing deeply nested state/node structures can now open correctly rather than failing at the JSON parser depth limit.

Interface evolution 1

  1. Removed the Net Wealth box from the Bernoulli Utility Function editor because it was considered confusing and not useful.
Major version chapter

v5.0 - v5.1

Rational Will 5.0-5.1 expanded decision modeling, reporting, and reliability

Versions 5.0 through 5.1 broadened Rational Will’s analytical toolkit with dedicated AHP modeling, decision-tree integrations for Markov and Bayesian analysis, and richer decision visualizations. The releases also improved reporting and chart access, added editable Decision Tree payoff report cells, and addressed calculation, project-state, AHP, and chart-related issues.

30 features 32 bug fixes 1 interface change

Major features 30

  1. Introduced a dedicated AHP modeling tool with unlimited sub-criteria levels, a graphical hierarchy tree, constrained pairwise inputs, and an interactive matrix view.
  2. Expanded decision-tree analysis with probability-tree analysis, direct Markov Decision Process integration, and Bayesian Network and Bayesian Inference integration.
  3. Added decision insight tools including an Event Distribution Chart, criterion-weighted stack and polar charts, and configurable utility units.
  4. Improved reporting and chart access: Decision Tree payoff report cells became editable, terminal-node information was exported, and charts gained a context menu for data, image copying, and Excel export.

Bugs and reliability 32

  1. Corrected analysis calculations affecting Decision Tree minimax regret, Markov time-variant probabilities, entropy, and cost-effectiveness discounting.
  2. Resolved stability issues including crashes and corrupted state when working with projects, diagrams, Bayesian projects, and separate chart windows.
  3. Improved AHP consistency by preventing deleted items from appearing in matrix views, placing wizard-added criteria at the root level, and refreshing renamed criteria in pairwise matrices.
  4. Addressed chart and display problems, including chart arrangement, cut-off pie charts, missing radar options, and Cost Effectiveness Plane axis controls.

Interface evolution 1

  1. Bayesian Inference changed its probability range from 0-100 to 0-1.
Major version chapter

v3.0 - v3.7.1

Rational Will 3.0-3.7.1: richer decision modeling and stronger reliability

Across versions 3.0 through 3.7.1, Rational Will expanded decision-modeling tools, analysis capabilities, and Decision Tree support. The releases also concentrated on stability, reporting, chart behavior, and correct decision-criteria calculations, while simplifying how money objectives are represented.

19 features 32 bug fixes 1 interface change

Major features 19

  1. Improved Pros and Cons and Markov Decision Process screens, with option editing, bulk deletion, drag-to-rearrange, settings, and visual utility-value status cues.
  2. Enhanced custom utility and Markov expressions with drag-and-drop inputs, syntax help, token-based function editing, and custom expression names and units.
  3. Expanded analysis with histogram bin sizing, Decision Tree pathway-value tooltips and sensitivity intersections, plus machine-learning model testing with confusion-matrix charts.
  4. Added Cost-Benefit Analysis in Pros and Cons and a dedicated healthcare Cost-Effectiveness Analysis module in Decision Tree.

Bugs and reliability 32

  1. Addressed Decision Tree calculation and selection problems affecting expected values, decision criteria, recommendations, and Cost-Effectiveness context after project loading.
  2. Resolved reporting and visualization issues, including decimal rounding, empty Bayesian chart tables, infinity chart handling, report chart output, and report-generation freezes.
  3. Fixed crashes and instability involving Pros and Cons, small windows and charts, third-party assemblies, project loading, Markov modeling, and system exceptions.
  4. Corrected printing and clipboard-related problems, including non-admin print crashes, clipboard exceptions, and cross-instance Decision Tree node pasting.

Interface evolution 1

  1. Removed the separate Money objective type: number objectives can instead be treated as money, simplifying the objective experience.
Major version chapter

v2.0 - v2.17

Rational Will 2.0-2.17: Stronger decision trees and machine learning

Across versions 2.0 through 2.17, Rational Will expanded decision-tree creation, analysis, project workflows, and machine-learning support. Updates also focused on calculation correctness, reporting, data handling, performance, and application stability.

31 features 40 bug fixes

Major features 31

  1. Built out Decision Tree work: edit node text, optionally show metrics on nodes, view policy or rule sets, and copy or export diagrams.
  2. Added Decision Tree generation from CSV, Excel, or SQL Server data, then added cancellable progress and significantly improved machine-learning performance and progress reporting.
  3. Added multilingual support, Windows file associations for double-click opening, and saving diagram zoom, spacing, and width in project files.
  4. Improved objective setup with clearer navigation and tooltips, plus an Add more objectives action during the creation wizard.

Bugs and reliability 40

  1. Corrected decision-analysis calculation and interpretation issues, including consistency ratio loading, utility calculations, certainty equivalent logic, and Radar Chart utility values.
  2. Addressed crashes in core workflows including cross-instance node paste, sensitivity analysis, Print Preview, Machine Learning rebuild, and Stochastic Dominance.
  3. Made Decision Tree Machine Learning more resilient to missing data and Excel continuous or DateTime attributes.
  4. Corrected reporting problems where learned rule sets were omitted and sensitivity charts could show clipped legends and scrollbars.
Major version chapter

v1.0 - v1.2

Rational Will 1.0-1.2: Analytic Hierarchy Process and stability gains

Rational Will launched in version 1.0, followed by usability-focused maintenance in 1.1. Version 1.2 expanded its decision-analysis capabilities with the Analytic Hierarchy Process and addressed crashes, including failures caused by null references and by using Markov Decision Process after closing a project.

1 feature 2 bug fixes

Major features 1

  1. Added Analytic Hierarchy Process support, expanding the available decision-analysis methods.

Bugs and reliability 2

  1. Resolved null reference crashes to improve application stability.
  2. Fixed a Markov Decision Process crash that occurred after a project was closed.

The movement, year by year.

Every column shows the bugs, features, and interface work delivered in product releases that year.

219 work items covered
3
2018
50
2019
43
2020
30
2021
90
2022
0
2023
1
2024
0
2025
2
2026