Life after Acorn: a modern home for your TDABC model

Where does Acorn stand today?

Acorn Systems was the pioneer of TDABC software, and the first generation commercialised the method for enterprise profitability analysis. The line did not stop there: IgniteTech markets Acorn today.

The product later changed hands more than once, and today it is marketed by IgniteTech as Acorn, an activity-based costing and profit management platform - described by the vendor as a Time-Driven Activity-Based-Costing platform. So this is not a story about a product that went away. The practical situation many users of older installations describe is narrower: an on-premise deployment from another era and a shrinking pool of people who know it.

That is not a criticism of anyone involved. Software generations turn over. Methods, when they are good, do not.

Why is the method worth keeping even if the tool is not?

TDABC solved a real problem: classic ABC drowned in surveys and re-surveys, and TDABC replaced them with time equations and capacity cost rates. That insight is as valid in 2026 as it was in 2004.

If your Acorn-era model still runs, it almost certainly encodes years of hard-won knowledge: how long tasks actually take, which drivers matter, where capacity hides. That knowledge transfers. The install base does not have to.

The asset is the equations, not the executable.

What does the modern deployment look like?

CostCtrl is a SaaS TDABC platform. No servers to patch, no virtual machines to keep alive, no single veteran who is the only person who knows where the model lives.

It works from the exports your systems already produce: CSV files and ERP exports, at transaction level. Our largest current model processes 525,000 transaction rows for a logistics operator, so scale is not the constraint it was in the on-prem era.

Time equations, capacity cost rates, whale curves and dashboards are native. The outputs your board already understands arrive without a separate BI project.

And the operating model is deliberately front-loaded: Cost and Profitability Consulting runs a free Profit Check, rebuilds the model with your team, and hands it over. You stay autonomous.

How does a migration from a legacy TDABC tool actually work?

How do legacy on-prem tools and CostCtrl compare?

Two of three sound familiar? Thirty minutes settles it.

You still believe in TDABC, and the model has paid for itself more than once. But the deployment depends on infrastructure someone wants to decommission, or on a person who is close to retirement, or on a support arrangement nobody can quite confirm.

If two of those three sound familiar, the migration conversation costs you thirty minutes and nothing else.

Fair questions.

Is CostCtrl based on the same TDABC method as Acorn?

Yes. Both implement Time-Driven Activity-Based Costing as defined by Kaplan and Anderson: time equations for the work, capacity cost rates for the resources. Your existing modelling logic is conceptually portable.

Can we reuse our existing time equations?

Largely, yes. Equations are harvested from the old model, refreshed where the business has drifted, and reloaded. The knowledge in a mature TDABC model is the most valuable thing to migrate, and the easiest.

Do we need an integration project to feed CostCtrl?

No. CostCtrl reads CSV and ERP exports your ERP already produces, at transaction level. No middleware, no HANA, no era-specific loaders.

How long does the move take?

Typically weeks: a free Profit Check, a harvest-and-refresh pass on the equations, then a reload from current exports. The bottleneck is usually calendar time with process owners, not technology.

We lost the person who ran the old model. Is it too late?

No. If the model files or documentation survive, we harvest what we can; if not, TDABC models rebuild quickly precisely because time equations are estimated from a small set of observations, not from company-wide surveys.