CASE STUDY · EST. 2011 · APAC

Overtime cut by 90%. Defects down 95%. An ATO release train returned to sustainable pace.

The Situation

The Australian Taxation Office had been running a scaled agile delivery program across a major transformation initiative for several years, including Tax Time and Superannuation. When a new senior executive took oversight, they identified a disconnect between the programme’s delivery metrics and its stated purpose: faster delivery with better quality. Activity was being measured. Value was not.

ZXM was engaged to map the program’s delivery system, identify the structural conditions limiting performance, and provide recommendations to improve adaptability, throughput, and quality across their value streams.

Three core needs emerged, focused on metrics to understand capability instead of simply deliverables:

Improved adaptability and responsiveness

Reduce time to adapt to and incorporate change, particularly in a politically volatile environment.

Improved workforce effectiveness

Increase productivity, improve quality, decrease costs and decrease risks.

Resilience to change

Build-in improved ability to adapt to disruptive change in an iterative and low-risk way.

What the diagnostic found

ZXM mapped the program’s delivery system before making any recommendations, reviewing lead time, throughput, cycle time, delivery cost, and defect rates across the Agile Release Trains.

The primary finding was that the delivery system had drifted from its design intent. Scaled practices were in place on paper, but teams were operating in functional silos with downstream testing — which extended cycle time and concentrated defect risk at integration. Waterfall sequencing persisted inside Sprints, with six to nine months of upfront design absorbing capacity that could not respond to change. Prioritisation was absent: all projects ran simultaneously with equal priority, resulting in a lack of focus and eroding throughput across every stream. Quality standards were inconsistent, and the absence of a shared Definition of Done meant that rework was absorbed invisibly into overtime rather than surfacing and being resolved at the system level.

Each condition was independently verifiable and was confirmed across multiple Release Trains. Together, they produced a program that was measuring activity while value delivery stalled.

What changed

The intervention targeted the delivery system, not the teams. ZXM’s recommendations addressed the structural conditions the diagnostic had named: team design was reconfigured to bring testing capability inside delivery teams, ending downstream integration risk. Cross-functional team formation replaced functional silos as the operating unit, which eliminated the handoff delays that had extended cycle times. Upfront design phases were removed in favour of value stream management, reducing total lead time. Prioritisation was introduced, concentrating capacity on the highest-impact work. A consistent Definition of Done was applied across all Agile Release Trains, creating a shared quality baseline and making rework visible before it reached overtime.

What held

Within 12 months, overtime dropped by 90%. Defects decreased by 95% over the same period. Throughput increased by 25% in a comparable delivery window to prior years — more value delivered without additional headcount.

Agile Release Trains returned to a sustainable operating pace. Self-organisation within Release Trains, combined with structured integration and closer engagement with business stakeholders, produced the throughput gains. The constraint had not been the teams. It had been the operating architecture they were working inside.