Client: Confidential

Critical Task Analysis (CTA)

Location: United Kingdom
Value added by Xodus

Xodus Group’s unique fully integrated Human Factor capability within the Technical Safety and Risk team uniquely positioned us to undertake a Critical Task Analysis and a Human Reliability Assessment for our client. Our integration within the client enabled us to comprehensively understand the needs and processes of the client and effectively engage with all the appropriate internal stakeholders. Our unique capabilities and our philosophy of working with, not for, the client enabled us to go above and beyond the industry best practices and deliver comprehensive results allowing the client to make the most informed decisions possible.

Case Study – Critical Task Analysis (CTA) 

Human Reliability and MAH Risk Loss of human reliability (human error) has long been identified as a contributing factor to incident causation.  Commonly cited statistics claim human error is responsible for anywhere between 70-100% of incidents. 

As a means of providing improved process safety assurance for its operational assets a client requested Xodus to provide Critical Task Analysis (CTA) services.  4 facilities were considered in the scope (2 onshore and 2 offshore).   

Xodus held a detailed awareness session with relevant company personnel such as the site HFE focal points.  The project then rolled into a detailed process for completing full CTA.  This process was aligned to the full Xodus method statement for completing CTA which follows industry good practice such as that provided by the HSE, OGP and the Energy Institute.  

Human Reliability Assessment (HRA) 

Key to the execution of the project was the completion of Human Reliability Assessments (HRA) on all tasks identified as being safety critical.  This was facilitated through a guideword driven process similar to the Failure Modes and Effects Analysis (FMEA), or Hazard and Operability (HAZOP) techniques applied in engineering risk analyses.  For each critical task the HRA identified:

+ Existing safety measures in place.
+ Potential for recovery from identified failures.
+ The potential consequences of the failure if recovery is not achieved.
+ The Performance Influencing Factors (PIFs) relevant to the failure.
+ Additional measures to prevent or further reduce chance of failure or measures to reduce the consequences or improve recovery potential.


Following completion of the HRAs, relevant procedures were updated or developed from scratch.  This step was critical, as it ensured all the good work completed through the HRAs, was pulled through into operational procedures used by site personnel.   

Established good practice such as that outlined within HSG 48 was used during the development of said procedures.   

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