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Use the established LOPA method

While traditional LOPA calculations focus on one single scenario, the LOPA functionality in BowTieXP takes all scenarios into account while calculating the top event frequency.

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Integrate your own quantification method in BowTieXL

Use a Microsoft Excel compatible spreadsheet to create your own methods for quantified and visual risk assessment in BowTieXP.

  • LOPA (plugins)

    Layers of Protection Analysis (LOPA) is a semi-quantitative risk analysis in which the frequency of a negative event is calculated according to the risk reduction by the Independent Protection Layers (IPLs). In bowtie-based LOPA, you calculate the frequency of a consequence, given the threats and IPLs in play. The LOPA functionality allows you to fill in the initial frequencies of the threats and the Probability of Failure on Demand (PFD) for the barriers. You can also add target frequencies for the consequences and the top event. The software automatically calculates the relevant numbers, like the consequence frequency, and displays them on the bowtie diagram if desired.

    Quantify page images CGE Risk

  • Excel Integration in Bowtie XL

    BowTieXL introduces a Microsoft Excel compatible spreadsheet into BowTieXP, which exposes all the information in the case file as tabular data in this spreadsheet. This allows you to use that data to do spreadsheet calculations, based on that data, and feed the results back into your bow-tie model. It also allows you to define extra variables on the bow-tie diagram itself for use in calculations. This functionality gives you a lot of freedom to create what you need. You can for instance calculate average effectiveness of controls, use the effectiveness score to color controls, create a financial model that lets you know what the cost reduction is for each control that you add or make a questionnaire that feeds back into your bowtie. Calculating aggregated effectiveness of barriers One of the most popular uses of the spreadsheet function is the ability to calculate the aggregated effectiveness of controls. Previously there was no real way to combine the effectiveness of multiple barriers. Now, the Excel functionality makes it possible to aggregate values across multiple barriers to ascertain the overall effectiveness. The applications for such calculations are far reaching, for instance in determining your ALARP level.


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Combine with our other software solutions

BowTieServer unites different risk disciplines in a single, central repository with bowties and related information.  It combines all the powerful tools we offer and unifies them across the organization.

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IncidentXP allows an organization to maximize learning from incidents: link investigation results to the bowtie risk assessment to detect trends and improve your risk assessment and management.

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BowTieXP is the most advanced software tool based on the bowtie method. The visual risk assessment the method provides improves risk understanding, communication and management.

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Feel free to call us with any questions you might have. Our enthusiastic support team is here to help you choose the solution best suited to your needs.

Call us now at +31 (0)70 362 6126 (09:00-17:00CET) or visit the Support section on our website.

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