CARE® Reliability Software

CARE® comprises an integrated set of software tools, offering engineers a complete solution for all RAMS (Reliability, Maintainability,Availability and Safety) aspects of a product. CARE analyzes various components failures and their impact on system operational behavior and safety, while 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 product reliability and robustness.

Features & Benefits

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

CARE Reliability software suite is available in three module packages:


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

CARE MTBF modules include:

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


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CARE DfR is a core package comprising the most essential software for DfR analysis, allowing for a smooth workflow from MTBF to RBD.

CARE DfR modules include:

  • 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 – a full solution for reliability analysis in one complete workflow.

CARE Complete modules include:

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

About CARE Reliability Software

CARE consists of several key modules that can be integrated using a core database to provide complete RAMS analysis for reliability and safety. Unlike other reliability tools, CARE modules can operate individually or integrally, according to client preferences.


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


Once the MTBF has been calculated, the same product tree can be utilized for CARE-FMEA/FMECA and Testability analysis (TA). FMECA helps classify all possible failure modes for components or functions according to 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 defining the product redundancy structure in order to evaluate the Reliability and the MTBCF (Mean Time Between Critical Failures) of the product. CARE-RBD shows the success path, which indicates the assemblies required for the product to function. By contrast, 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 performed by integrating the FMEA, TA, RBD and FTA modules into a single analysis path. For example, FMEA identifies all failure modes which are critical (probable) and have high severity levels. TA checks if these failures can be detected and isolated using built-in-tests to reduce risk.  Afterwards, RBD and FTA  calculate the probability of safety related failures while taking into account backups and redundancies which reduce system risks.

Step 5: Maintainability

Once the product is reliable and safe, maintenance analysis can proceed  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, an an Initial Maintenance Concept will be optimized by apmOptimizer.



CARE module is illustrated by the following flow chart.

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

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

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

RBD: This module helps system engineers 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.