Why Sustainment Thinking Is Becoming Critical for Australian Public Sector CIOs

Lessons from Defence about long-term capabilities

Defence encountered this problem long ago. It recognised that for critical capabilities, delivery is only the starting point. What matters most is endurance. Endurance is the ability to operate, adapt and remain viable throughout the capability’s lifecycle. That is why Defence talks about sustainment. Sustainment explicitly addresses the funding, performance, risk and accountability required to manage a capability throughout its lifecycle, not merely maintain it.

It is treated as a strategic discipline because failure is not acceptable and costs escalate rapidly when lifecycle risk is left unmanaged. Importantly, sustainment did not emerge to add bureaucracy. It emerged to retain control and ensure investments remain fit for purpose.

Public Sector applicability

While the term itself is often used in a Defence context, the conditions that gave rise to sustainment thinking now exist across Australian Public Sector federal agencies. Many agencies operate enterprise platforms and digital services with ten-to-twenty-year horizons. They manage long running outsourced or managed service contracts worth hundreds of millions, sometimes billions. They also oversee capabilities that span multiple Secretaries or Ministers and multiple budget cycles. In substance, these are sustainment responsibilities, whether or not they are recognised as such. The risk is that without explicit whole of life planning, agencies drift into tacit business as usual. When that happens, costs creep up, accountability blurs and capability debt accumulates over time.

None of this suggests that agencies outside Defence should import Defence frameworks wholesale. Wholesale transfer of Defence sustainment models would introduce unnecessary complexity without solving the underlying issue. What is needed instead is translation. This means taking the core discipline of sustainment thinking and adapting it to broader Australian Government contexts. This is also where sustainment differs from concepts such as IT asset management, FinOps or technology business management. Those disciplines are valuable and often complementary, but they tend to optimise components of cost, assets or financial transparency. Sustainment forces a broader question. Who owns the capability over its full life. How is it funded explicitly. How is success measured beyond delivery.

A leadership imperative for Public Sector CIOs

For CIOs in Australian Public Sector federal agencies, this becomes a leadership challenge as much as a technical one. CIOs are increasingly accountable for outcomes long after the project has been disbanded. They are responsible for commercial arrangements that limit flexibility and for platforms that cut across policy, service delivery and regulatory functions. Sustainment thinking reframes the conversation from "How do we deliver this?" to "How will we operate, evolve and fund this capability over its lifetime?"

That shift often requires different conversations with CFOs, Secretaries and central agencies. Those conversations can be challenging, but they are essential to maintaining control of mission-critical capabilities.

The opportunity is to learn from Defence without becoming Defence. Applied thoughtfully, sustainment thinking makes lifecycle costs, risks and accountabilities visible. It aligns funding, contracts and governance with the realities of long-lived digital services and helps Australian Public Sector agencies protect value long after implementation. The question is no longer whether agencies are sustaining capabilities. They already are. The real question is whether sustainment is being managed deliberately or left to evolve by default. For today's CIOs, adopting a sustainment mindset is not simply good governance. It is how they build the resilient, adaptable digital capabilities that tomorrow's public services will depend on.

What Public Sector CIOs Can Do Today

• Embed lifecycle planning from day one. Require major digital investments to include sustainment strategies covering operating costs, capability roadmaps, technical debt, renewal triggers and end-of-life considerations.
• Align contracts to long-term outcomes. Structure managed services and outsourcing arrangements around capability performance, adaptability and value realization, not just service-level compliance.
• Establish clear capability ownership. Assign accountable leaders for critical platforms beyond project completion, with responsibility for performance, risk, funding and modernization decisions.
• Create governance that spans budget cycles. Treat major digital platforms as enduring capabilities and review them regularly through a whole-of-life lens rather than as completed projects.
• Measure success beyond delivery. Track capability health, user outcomes, resilience, risk exposure and long-term value realization alongside traditional project milestones.