Conclusion: This month, a number of high-profile systems outages were reported, again flagging risks associated with operating complex IT environments and business functions which rely on these systems. Seemingly minor incidents, or a combination of disparate problems, can result in serious and costly system failures. These problems are exacerbated when issues impact on a company’s service delivery mechanisms and their own customers. This month, a power surge which triggered a global systems outage at British Airways left 75,000 customers stranded, at an estimated cost of $135M. A failure at Westpac left online users unable to access funds for 24 hours, following a similar week-long online and mobile banking failure in November 2016. The Australian Taxation Office has experienced serious service disruptions as a result of three outages in recent months, related to two separate service providers. A review of two failures by service provider Hewlett Packard Enterprise found a number of issues contributed to ATO system collapses and an inability to respond to them, including monitoring systems used to detect operating errors that were not activated, and access to recovery tools required to resolve problems being stored on the network which failed. These types of incidents highlight the impact of unexpected failures and inadequate response measures as well as the need for both vendors and customers to prepare for such events.