What is Business Impact Analysis?
A Business Impact Analysis (BIA) is a systematic process for determining which business processes are critical, what the impact of disruption is, and how quickly recovery is needed. It is a core activity within Risk Management and Business Continuity.
In OT environments, a BIA helps prioritise systems such as SCADA, PLC, MES and supporting infrastructure based on their role in production and safety.
🧠 How does a Business Impact Analysis work?
- Identify critical processes
- E.g. batch production, power supply, cooling, data acquisition
- Map systems and dependencies
- Including HMI, Engineering Station, Historian, IO modules
- Assess the impact of an outage on:
- Safety
- Productivity
- Quality
- Environment
- Reputation
- Determine recovery time objectives (RTO) and recovery point objectives (RPO)
- How quickly must it be restored?
- How much data may be lost?
The BIA is the basis for Disaster Recovery, Incident Response and Backup strategies.
🏭 Use of BIA in industrial networks
- Establishing that an outage of a SCADA server must be restored within 30 minutes
- Estimating production loss in case of a PLC outage or communication Switch failure
- Identifying processes for which there is no manual fallback
- Prioritising patch and update policy based on impact
- Supporting investment decisions (e.g. for redundancy or Fail-safe design)
A good BIA enables data-driven decisions on security, availability and continuity.
🔍 BIA vs. Risk Assessment
| Aspect | Business Impact Analysis | Risk Assessment |
|---|---|---|
| Focus | Impact of disruptions | Likelihood and effect of risks |
| Scope | Business processes and continuity | Threats, vulnerabilities and risks |
| Output | Recovery priorities, RTO/RPO | Risk score and mitigating measures |
| Combination | Part of Business Continuity planning | Part of Cybersecurity and compliance |
🔐 Security considerations
- Helps determine which OT assets need the strongest protection
- Supports Defense in Depth strategies by focusing on impact
- Improves incident response planning and training scenarios
- Required for compliance with IEC 62443, NIS2 and ISO 27001
- Maps dependencies, including third parties or cloud components
Without a BIA, the context for prioritising security measures effectively is missing.
📌 In summary
Business Impact Analysis is an essential process for understanding the consequences of system outages and underpinning recovery strategies. In OT environments, it helps protect critical processes, people and assets against disruption and attack.