CARE® Reliability Software

CARE® is an integrated set of software tools designed to give engineers a complete solution for all RAMS (Reliability, Maintainability,Availability and Safety) aspects of a product. CARE analyzes Different types of components failures and the effects these failures have on system operational behavior and safety, taking into account redundancy and backup elements. Unlike other tools, CARE provides all reliability analysis in one integrated platform – including traditional Mil-Std, ISO 9000, EN and IEC standards methods and advanced RAMS & ILS analysis techniques. The use of BQR CARE improves and enhances the product reliability and robustness.

Features & Benefits

  • Qualifies for the highest standards demands
  • Provides MTBF estimations during design
  • Reduces the time needed to perform RAMS analysis
  • Easy to master and operate
  • Used in the full-scale development as a bottom-up prediction/analysis
  • Recommends optimal redundancy for high-availability systems

The CARE Reliability software suite is sold in three different module packages:


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The CARE MTBF is the most basic package for conducting MTBF analysis on electronic, electromechanical and mechanical systems.

The CARE MTBF modules are:

  • MTBF one prediction method
  • MTBF for Mechanical parts
  • Stress Derating analysis


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CARE DfR is the core package that compiles the most essential software for DfR analysis, allowing for a consecutive flow of work from MTBF to RBD.

The CARE DfR modules are:

  • MTBF one prediction method
  • MTBF for Mechanical parts
  • Stress Derating analysis
  • FTA
  • RBD

CARE Complete

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CARE Complete is a full set of all BQR CARE suite modules at an attractive price. The full solution for all reliability analysis in one complete workflow.

The CARE complete modules are:

  • MTBF all prediction methods
  • MTBF for Mechanical parts
  • Stress Derating Analysis
  • FTA
  • RBD + Markov + Network
  • Tastability analysis
  • MTTR
  • Risk and Safety analysis

About CARE Reliability software

CARE consists of several main modules that can be integrated using a core database to provide a complete RAMS analysis for reliability and safety. Contrary to other reliability tools the CARE modules are also able to function independently from each other.


CARE-MTBF Calculates the Mean Time Between Failures of the components and assemblies up to the system level by using a product tree. The MTBF can be done on electronic and mechanical equipment. The MTBF is calculated using a serial model (without taking into account redundancy and backup elements), which is the worst case scenario, since any component failure will result in system failure.


Once the MTBF has been calculated, the user can use the same product tree to perform CARE-FMEA/FMECA and Testability analysis (TA). FMECA helps to classify all possible failure modes for components or functions with severity and criticality using a bottom up approach. The Testability module analyzes the ability of the internal Built-in-test circuits to detect and isolate the failures defined in FMECA.

Step 3: FTA and RBD

The next step is to define the product redundancy structure in order to evaluate the Reliability and the MTBCF (Mean Time Between Critical Failures) of the product. The CARE-RBD shows the success path, which means which assemblies are needed in order for the product to function. In opposition to this, the CARE-FTA (Fault Tree Analysis) provides a top-down approach of a “system level failure” and shows the possible causes by using a logic gate tree.

Step 4: Safety analysis

Safety analysis is then done by integrating the FMEA, TA, RBD and FTA modules in one analysis path. For example, FMEA identifies all failure modes which are critical (probable) and have a high severity. TA will check if these failures can be detected and isolated using built-in-tests to reduce risk.  After that, RBD and FTA will calculate the probability of safety related failures while taking into account backups and redundancies which reduce the system risk.

Step 5: Maintainability

Once the product is reliable and safe we can proceed with the maintenance analysis by using the CARE-MTTR. The MTTR is the average “Remove and Replace time” of all the faulty assemblies. Complete maintenance analysis which accounts for logistic delay times is later done by the BQR’s apmOptimizer.

Finally we will introduce an Initial Maintenance Concept which will be optimized by the apmOptimizer.



The CARE module is broken down into the following flow chart.

MTBF: This module provides failure rates and MTBF prediction for each component, assembly and for the entire system based on standard prediction methods.

FMECA/FMEA: This module introduces all components potential failure modes, ranked by the severity and criticality of its effect, in order to plan corrective actions that may be taken to eliminate or control the high risk items.

TESTABILITY: This module will analyze the ability of the internal Built-in-test circuits to detect and isolate the failures defined in FMECA.

RBD: This module helps the system engineer to model complex redundant systems by calculating bottom to top: reliability, availability, down-time, MTBF, MTTR, MTBCF, MTTCF and failure rates for the system and for each assembly.

FTA: This module is a top-down, analytical technique which starts with a potential undesirable event, and then identifies all related sub-events that could cause that top event to occur using simple logic gates modeling.

MTTR: This module is used for maintainability prediction, the average time to repair a failure and return the system to normal operating conditions.



CARE reliability analysis workflow


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