Answer: Actually, there is no definitive order to perform risk assessment and business impact analysis, and the choice for one or another will depend on your expectations:
- By doing BIA first you will have a prioritized list of processes and services that can impact the most of your business in case of disruptive incidents, then you can go to assess the most relevant risks for the most critical processes and services.
- By doing risk assessment first you will have a prioritized list of risks your organization is most exposed to, i.e. the most potential disruptive incidents, then you can go to assess the impact on business regarding the processes and services affected by those risks.
Particularly, we prefer to do risk assessment first because this way, you will have a better impression of which incidents can happen (which risks you’re exposed to), and therefore be better prepared for doing the busine ss impact analysis (which focuses on consequences of those incidents).
2. Do I include the BIA risks in my risk register and if yes then do I reference the BC plans for the treatment plan?
As an example, would a fire be raised as a risk in the risk register as well as in the the BC plans?
Answer: If the risks used to support the BIA process are related to information you want to protect with your ISMS (i.e., risks that impacts information), then you need to include them in the risk register for ISO 27001.