System Analysis
Reliability Block Diagrams
Model how subsystem success and redundancy affect the reliability of the complete system.
Purpose & Benefit
When This Activity Helps
Use during architecture selection or when assessing redundancy and single points of failure. A clear success model supports informed trade-offs between complexity and reliability.
Project Information
Typical Inputs
The scope is tailored to the available evidence. Useful inputs include:
- Required system functions and success criteria
- Architecture, redundancy and dependencies
- Component or subsystem reliability data
Engineering Approach
How SPACEREL Supports Your Project
SPACEREL develops series, parallel or appropriately structured success models and checks the basis for independence and redundancy assumptions. Common-cause, switching and repair effects are identified where a simple block model is insufficient.
Documented Outcomes
Typical Deliverables
Deliverables are agreed before work starts and can include:
- Reliability block diagram and calculation basis
- System estimates and contributor assessment
- Architecture improvement recommendations
Methods & Evidence
Selected References
- IEC Technical Committee 56: Dependability
Select the applicable methods and requirements for the product and programme.
Project Context
Where This Activity Can Help
Explore the relevant lifecycle stages.