It’s only natural to believe that a strategy for legacy systems should begin with the age of the technology. But in our experience, it’s better to begin with business outcomes and the risks and constraints created by those systems.
So for CEOs and boards, the questions are actually simple: which systems are still fit for purpose, which need attention now, and where will investment create the greatest business value?
‘Legacy’ does not necessarily mean ‘old.’ A more useful way of thinking about it is technology whose continued use creates an unacceptable burden or risk, or which can no longer be effectively supported or secured. That distinction matters, because replacing every older system is expensive, disruptive, and often unnecessary.
How should you set a strategy for legacy systems?
Consider the GRIP framework, which gives leadership teams a straightforward way to assess the systems with four criteria: Growth, Risk, Innovation, and Performance.
G = Growth
Ask yourself:
- Does our technology – and our technology strategy – actively support our growth ambitions?
- If a buyer or investor looked under the bonnet tomorrow, would our systems help or hinder a deal?
- Can our systems cope with more customers, transactions, products, or locations without undue cost or manual effort?
Legacy systems can become a constraint when the business has outgrown the processes they were designed to support. Workarounds multiply, integrations become harder to maintain, and management information can become fragmented.
The issue becomes particularly important ahead of investment, acquisition, or sale, when technology is likely to be examined during due diligence. Leadership teams should be able to explain what the organisation relies on, where material risks sit and how technology investment supports the growth plan.
R = Risk
Ask yourself:
- When did we last assess our exposure to a major system failure or cyberattack?
- Which critical processes depend on one or two individuals?
- Which systems are no longer supported by their supplier or cannot be patched?
- Do we know what data these systems hold and which other systems depend on them?
Legacy platforms attract greater cyber risk and can make insurance renewals more difficult and expensive. Old systems fail more frequently and recover more slowly, and hidden or informal processes add further risk. The UK’s National Cyber Security Centre is clear that, in the long term, moving away from obsolete systems should be the goal, with the risks actively managed in the meantime. We cover this in more detail in how unsupported systems create business risks.
I = Innovation
Ask yourself:
- Could we use AI effectively today, or does the state of our data make that difficult?
- Can modern applications access the information in our core platforms?
- Are competitors able to launch or change services faster because their technology is more adaptable?
AI and analytics depend on usable, governed, and accessible data. A legacy platform may still perform its core job reliably, yet prevent the business from efficiently using data across functions or connecting new tools.
That does not automatically justify replacement. Integration, data remediation, or selective modernisation may deliver the required outcome at lower risk and cost. The strategic issue is whether the current architecture gives the business realistic options for change.
P = Performance
Ask yourself:
- How many critical processes depend on spreadsheets or manual rekeying?
- Where else are employees compensating for system limitations with manual workarounds?
- How long does a straightforward business change take to implement?
- What is the true cost of maintaining the current environment?
A system can be technically stable and still perform poorly for the business. Slow processes, duplicate data entry, hard-to-produce reporting, and expensive specialist support all affect productivity and decision-making.
Performance should therefore be assessed in business terms, not only uptime. Consider the cost and effort required to operate the process, the quality and timeliness of information, the employee experience, and how quickly the organisation can respond to change.
Keep, improve, or replace? Make the decision deliberately
A strategy for legacy systems based on the GRIP assessment should lead to prioritisation, not an automatic replacement programme. For each important system, leadership can decide whether to retain it, reduce its risk, improve or integrate it, or replace it entirely.
A good roadmap sequences these decisions according to business value, risk, and dependency. Replacing a visible front-end system may achieve little if the underlying data, integrations, or processes remain unchanged. Equally, a large transformation can create unnecessary cost and operational disruption if a smaller intervention solves the real problem.
This is where independent technology leadership matters. A fractional CIO or fractional IT Director can help connect technology choices to commercial priorities, challenge supplier-led assumptions, and turn a list of technical issues into an investment roadmap the Board can understand.
What should CEOs and boards do next?
If GRIP shows that legacy systems are constraining growth, increasing risk, limiting innovation or reducing performance, your strategy for legacy systems should establish the facts and prioritise action.
Start with five things:
- Identify the systems and manual processes the business genuinely depends on.
- Record owners, suppliers, support status, data, and critical dependencies.
- Assess each area against Growth, Risk, Innovation and Performance.
- Decide what to retain, mitigate, modernise, or replace, with clear business reasons.
- Build a realistic roadmap that reflects cost, operational disruption, dependencies and leadership capacity.
A strategy for legacy systems is ultimately an investment and risk decision. The goal is a technology estate that is supportable, secure, adaptable, and proportionate to the value it delivers.
If you need help getting started, Freeman Clarke’s IT assessment for growth provides a structured discussion of your current systems, business applications, data, and cyber security, helping leadership teams identify where to focus first. It takes only two hours, and then we’ll provide ideas for how your technology strategy can ensure a platform for growth.