Operations
- EOQ = √(2DS/H)
- Little's law: L = λW
- M/M/1 utilization ρ = λ/μ; L = ρ/(1 − ρ)
Quality and reliability
- Process capability Cp = (USL − LSL)/6σ
- x̄-chart limits: x̿ ± A₂R̄
- Series reliability R = R₁R₂…; parallel R = 1 − Π(1 − Rᵢ)
Work design and human factors
- Normal time = observed time × rating; standard time = normal time × (1 + allowance)
- Learning curve: Tₙ = T₁n^b, b = log(rate)/log 2
- NIOSH recommended weight limit RWL = LC × HM × VM × DM × AM × FM × CM
Economics and management
- Present worth P = F/(1 + i)ⁿ
- Breakeven quantity = fixed cost ÷ (price − variable cost)
- Critical path = longest path through the project network
Test yourself on FE
Reading a summary is the easy part. Take the free 10-question diagnostic to see which of these domains you actually have, then drill the rest.