Recognize impact

e1ns.fta enables an assessment of risks and reliability of complex systems and processes. Thereby the e1ns system model and the function and failure nets are the basis for the FMEA and the fault tree. With this tool, failure causes are assigned to a main event. Everyone involved quickly gets an overview of the causes and combinations of causes that can lead to an undesired event.


Scope of Functions:


  • Qualitative Fault Tree Analysis (excluding probability calculation)
  • Qualitative Fault Tree Analysis (including probability calculation)
  • Probability calculation
  • Determination and evaluation of minimum cuts to determine their probabilities

Reuse knowledge and reduce effort

The e1ns template concept provides a fault tree analysis for variants or similar products and projects. The complete (generic) fault tree is available with all calculations; only individual adjustments need to be made.

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Hand in hand with FMEA

The system model and the function and failure network are the basis for FMEA and fault tree analysis. Newly detected faults are used for FMEA, or if required, they can also be used exclusively for the Fault Tree Analysis.

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Interaction with Functional Safety

e1ns.fta interacts with the FMEDA method and Safety Function Analysis (monitoring, response). When creating a Functional Safety Analysis, the FIT values are displayed at the basic events in the tree.

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Suitable for two types of Fault Tree Analysis

Qualitative Fault Tree Analysis

In this analysis, fault correlations are systematically considered over any number of system and process levels. Events and event combinations that lead to the respective main or intermediate event under review can be traced in the Fault Tree Diagram.

However, a reduced minimal solution set containing the essential combinations of faults is sufficient for fault analysis. This essential subset is called minimal cut.

Quantitative Fault Tree Analysis

In addition to the fault correlations, this analysis also takes probabilities into account. If the probabilities of all individual failure causes are known, the probabilities of occurrence can be calculated for the main or intermediate events analyzed. In the case of technical analyses, data on the failure behavior per time interval (FIT) can also be included.

Your benefits

Why e1ns.fta?

Systematic analysis

  • Large and complex systems benefit from good preparation.
  • e1ns.fta uses the system structure and the function and fault networks as a basis.
  • Fault trees of substructures can be used completely in further fault trees.
  • Newly discovered faults are included in the FMEA.


  • Calculation models are plugins and can be customized for companies.
  • Additional calculations can be developed via plugins and easily installed.

Easy and transparent

  • Simple operation with drag and drop.
  • Use of all existing analyses as input: system structure, function and fault networks, FMEAs.
  • Web-based Fault Tree Analysis enables global, enterprise-wide collaboration.
  • Visual, easy-to-understand representation.
  • Design decisions are supported.
  • Optimization approaches are identified.
  • Up-to-date data is always available.
  • Fast start-up due to uncomplicated operation.
  • Provision via web browser: No local installation required.

Using knowledge and saving efforts

  • The template concept of e1ns enables a Fault Tree Analysis for variants or similar products/projects. Only individual adjustments have to be made.

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Fault Tree Analysis

Building on an existing system and functional analysis, the Fault Tree Analysis can support and expand an FMEA fault analysis. Large and complex systems in particular benefit from a clear representation of the error relations. In addition, quantitative calculations of the failure probabilities enable the fault trees to be integrated into the Functional Safety Analysis.

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Discover all e1ns methods

Tailored methods set to your development process with the associated forms - simple, intuitive, in the web browser.

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Creation of FMEAs: Worldwide, easily and in a team.

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Inspection Plan

Quality assurance measurements during production.

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Process Flow

Process flows for identifying the causes of possible malfunctions.

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Change management with DRBFM: Success with methods.

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Functional Safety

Functional safety (ISO 26262) and FMEDA.

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Complaints & 8D

Permanent complaints resolution.

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Special characteristics

Ensure consistency of special characteristics.

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