Block Diagram

Jay Arthur
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Purpose: To design reliability of systems.

Use block diagrams for equipment and flow charts for processes. There are three types of block diagrams:

• System - physical relationship of major system components
• Functional - Categorize system components according to the function they provide.
  
• Reliability - depicts the effect of a component failure on the
  system's function.

To Create a Block Diagram

1. Lay out a diagram of parallel and serial components
2. Identify probability of failure of each component (value 0-1).
3. Calculate parallel probabilities. (a+b-a*b)
4. Multiply serial component probabilities (a*b)
5. Use parallel parts to increase reliability.

The Block Diagram is just one of the tools included in the QI Macros for Excel SPC Software for Excel.

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