Whether you run a small business or manage a multi-site operation across Australia, security threats are real and they’re evolving. A structured security risk assessment is how smart organisations identify what they’re protecting, what could go wrong, and what to do about it.

What Are the 5 Steps of Security Risk Assessment?

The five steps below form the foundation of any credible risk assessment for security. They’re based on the ISO 31000 frameworks and supported by HB-167.

Step 1: Define Scope and Identify Assets

Before anything else, get clear on what you’re assessing. Define the boundaries — which sites, systems, departments, and processes are included. Then identify every asset worth protecting.

Assets include:

• Physical assets — buildings, equipment, vehicles, stock
• Digital assets — servers, customer data, intellectual property
• People — staff, contractors, visitors
• Reputation — brand trust, regulatory standing

Why it matters: A poorly scoped assessment wastes resources and leaves blind spots. Involve stakeholders from IT, facilities, HR, and operations from the start. If you’re engaging a security consultant, this scoping stage is where they establish a defensible foundation for everything that follows.

Step 2: Identify Threats, Vulnerabilities and Existing Controls

With your assets mapped, identify what could harm them. In the Australian context, this includes both physical threats:

• Operational threats — human error, insider risk, contractor access
• Environmental threats — bushfire, flood, extreme heat (highly relevant in Australia)
• Technical vulnerabilities — outdated software, weak access controls, poor network segmentation

Also document existing controls already in place — CCTV, access management, staff training, incident response plans. A security consultant will benchmark these against industry standards and any obligations under the Australian Privacy Act 1988 or sector-specific regulations.

Step 3: Assess Risk Levels (Likelihood and Impact)

This is the analytical core of your security risk assessment. For each identified threat, rate:

• Likelihood — how probable is this threat? (Low / Medium / High)
• Impact — what’s the consequence if it occurs? (Low / Medium / High / Critical)

Combining these gives you a risk rating on a matrix. Focus your energy on high-to-critical risks first. Document your assumptions and data sources — this makes the assessment auditable and defensible, which is especially important if you’re subject to Australian government or insurance requirements.

Step 4: Determine and Implement Risk Treatment Plans

Once risks are rated, decide how to treat each one. The four standard options:

• Accept — low-priority risks you’ll monitor but not act on immediately
• Mitigate — reduce likelihood or impact through new or improved controls
• Transfer — shift risk through insurance or outsourcing
• Avoid — change or discontinue activities that create unacceptable exposure

For each high and moderate risk, develop a treatment plan that specifies responsible owners, timelines, required resources, and measurable success criteria. Prioritise actions based on cost-effectiveness and alignment with business objectives.

Engage a security consultant for specialised measures (for penetration testing, security architecture reviews) when needed. A good plan also includes a roadmap for ongoing improvements, not just one-off fixes.

Step 5: Monitor, Review and Continuously Improve

A risk assessment for security isn’t a set-and-forget exercise. The threat environment changes and in Australia, so does the regulatory landscape. Build in a continuous review cycle that includes:

• Regular updates to asset and control inventories
• Reassessment after incidents, major IT changes, or new regulations
• Tested incident response and disaster recovery plans
• Tracked performance metrics (time-to-detect, time-to-contain)

What Are the 5 C’s in Security?

The 5 C’s provide a useful mental framework for thinking about security holistically — whether you’re designing a new site or reviewing an existing risk assessment.

Change	Identify changes in your environment, systems, or personnel that introduce new risks.
Compliance	Ensure activities meet Australian legal obligations — Privacy Act, Work Health and Safety Act, sector-specific regulations.
Cost	Balance the cost of controls against the financial and reputational cost of a breach.
Continuity	Maintain operational resilience. Can your business keep running if an asset is compromised?
Coverage	Ensure no critical asset or threat is left unaddressed in your security risk assessment.

What Are the 5 P’s of Risk Assessment?

The 5 P’s help structure how you approach any risk assessment — useful whether you’re working with a security consultant or managing the process internally.

Purpose	Why are you doing the assessment? Define the objective clearly — compliance, insurance, incident response, or proactive protection.
People	Who is involved? Include staff, contractors, customers, and any third parties with access to your assets.
Processes	Which business processes are in scope? Understand how work actually happens — not just how it’s documented.
Premises	What physical locations and environments are involved? In Australia, consider site-specific factors like remote locations, extreme weather, and access control challenges.
Products/Systems	What technologies, platforms, and physical products does the business rely on? Each is a potential attack surface.

Practical Tips for Australian Businesses

• Get leadership buy-in first without executive sponsorship, risk treatment plans stall.
• Use a recognised framework such as ISO 31000 for your baseline.
• Don’t overlook environmental risks such as bushfire, cyclone, and flood exposure are real business continuity factors in many parts of Australia.
• Document everything — clear records of assets, threats, controls, and decisions support accountability and are required for many regulatory obligations.
• Schedule regular reviews — annually at minimum, or after any significant change to your business or environment.

Book Your Security Risk Assessment with CPTED Australia

A thorough security risk assessment isn’t about ticking boxes — it’s about genuinely understanding your exposure and making informed decisions about what to do next. For Australian businesses operating in a complex and changing threat environment, this kind of structured thinking is a competitive advantage.

Whether you’re working with a security consultant or managing your risk assessment for security internally, the five-step process above gives you a repeatable, defensible methodology you can build on over time. Start with scope, understand your threats, rate your risks honestly, act on what matters most, and keep reviewing.

Need help getting started? Reach out today or call (02) 9191 9771 to schedule your consultation and take the guesswork out of security risk management.