Your calculations, efficiently automated
IDIOM enables organisations to easily build, automate and evidence even the most complex business logic without replacing existing systems or relying on development teams.
If you operate in an environment where accuracy and accountability matter, IDIOM puts your subject matter experts in control of the rules that run your business.
Accelerate your project work
Your most valuable business logic is buried in legacy systems, spreadsheets and manual processes that you can't easily audit, scale or change.
IDIOM is a low-code rules engine that lets your own experts build, maintain and evidence that logic, then integrate it directly into your existing systems without a major change project or missing a deadline, accurately and quickly.
- You can update your rules yourself
Business logic can be changed and maintained easily, at your desired pace, with full visibility of what the calculation or process is doing. Your subject matter experts can see the rules, understand them, and have confidence in the accuracy of the outputs.
- Fully auditable
Prove compliance in a way that spreadsheets and legacy code cannot. This stops inadvertent changes being made to critical business logic, and provides full visibility into what was changed, when and by whom.
Get started fast with no need for major systems changes
IDIOM ingests data from any structure, and outputs in whatever format the receiving system requires. The same engine that validates a pricing model can orchestrate a data migration, manage a remediation workflow, or automate regulatory reporting.


Reasons to choose Heywood's calculations
Leverage Heywood's low code calculation and decisioning technology for a seamless end-to-end-process.
Your experts. Your control
Your experts update the rules themselves, without writing code.
This means you have complete control when building new and updating existing business logic, reducing reliance on IT and enabling faster response to change at a fraction of the usual cost.
Simple to start. Built to scale
IDIOM bolts on to your existing systems, meaning no major migration is required.
Get modern rules and process capability without the cost, risk and disruption of replacing core platforms. New complex calculations or processes can be implemented quickly with minimal disruption to business as usual.
Prove every decision
Every change to decision models is tracked: what, when and by whom.
This stops any inadvertent changes being made to critical business logic and provides an auditable trail for teams, boards and regulators, limiting risk exposure.
Accurate and efficient calculations
We perform a data quality analysis and highlight any missing or incorrect information before building the calculations, providing an accurate and seamless end-to-end process.
We work flexibly, quickly and efficiently and can help perform one-off exercises, provide an annual service or help you on demand.
“Heywood’s calculation engine is second to none. In terms of accuracy, it is extremely good and offers solutions to complex issues.”
Since 2014, New Zealand Police have worked with IDIOM to support the remediation of payments made to staff to ensure compliance with the Holidays Act 2003. This involved building a solution using their toolset that could recalculate payments by automating logical and numerical operations across the source payroll data. The tool was successfully used by New Zealand Police.”
- Deputy Chief Executive People
- NZ Police
- Middleware Project Director
- New Zealand Customs Service
Calculations resources
Who we work with
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