Field notes and methods
Guides for making a calculation operational.
These guides explain method choice, definition boundaries, and the questions to ask before a metric enters an engineering or maintenance decision.
Metrics
MTBF vs MTTF vs MTTR
Definitions, use cases, and common misuse.
ReadinessEquipment availability
Choose the correct availability boundary.
ArchitectureReliability block diagrams
Model success paths and dependencies.
Life dataUnderstanding Weibull analysis
Shape, characteristic life, and uncertainty.
PerformanceOEE loss categories
Turn a score into loss ownership.
EconomicsDowntime cost framework
Build a traceable consequence model.
DecisionRepair vs replace framework
Compare future risk and economics.
MROMRO safety stock planning
Balance service risk and carrying cost.
Method before dashboard.
Use a calculator to make arithmetic transparent, then use a guide to test its decision boundary. The reference desk keeps core definitions close at hand.