Measure the Flow.
Protect the Promise.

THE OFX FRAMEWORK

Three Signals. One Operational Truth.

Members only

OFX calculators and personal dashboard

The OFE, OEE and PEE calculators, saved measurements and personal dashboard are available to registered members who are signed in.

MODEL & MATHEMATICS / COMPLETE REFERENCE

Three metrics, three different questions

OFX is the operational flow-management methodology. OFE evaluates the ability to complete and release an order safely. OEE measures conversion of planned equipment time into accepted output. PEE is the approved weighted geometric extension of equipment effectiveness. Scores measure different aspects and cannot be treated as interchangeable.

OFE — Order Flow Effectiveness

Input: 19 integer assessments from 0 to 100: nine Readiness conditions, five mandatory Flow windows, and five Release conditions. R = round(mean of nine Readiness scores). F = minimum of five Flow scores. RR = round(Correct Quantity × minimum of Quality, Package Integrity, Release Evidence and Commitment Alignment / 100). OFE (%) = round(R × F × RR / 10,000). R, F and RR are percentages. The arithmetic follows the original OFX prototype, including intermediate rounding.

Worked example: R = 89, F = 82, RR = 86 gives OFE = round(89 × 82 × 86 / 10,000) = 63%. Controlled: 80% or above. Exposed: 65% to below 80%. At risk: below 65%. These are model classifications, not authorization to produce or ship.

Interpretation and constraints: The weakest mandatory process window controls F. The readiness average does not replace checking each critical condition. Numeric scores alone must never authorize execution or customer release. Required material, quality, safety and regulatory release gates must be validated separately, using a site-approved SOP. Do not infer business-critical blocking thresholds from the score.

OEE — Overall Equipment Effectiveness

Inputs: Planned Production Time and Downtime in minutes; Ideal Rate in consistent units/minute; Total Output and Good Output in the selected unit. Operating Time = Planned Production Time − Downtime. A = Operating Time / Planned Production Time. P = Total Output / (Ideal Rate × Operating Time). Q = Good Output / Total Output. OEE (%) = 100 × A × P × Q = 100 × Good Output / (Planned Production Time × Ideal Rate).

Worked example: 480 planned minutes, 60 downtime minutes, 10 sheets/minute, 3,500 total sheets and 3,430 good sheets yield A = 87.50%, P = 83.33%, Q = 98.00%, OEE = 71.46%.

Loss reconciliation: Downtime loss = downtime × ideal rate; speed/idle loss = operating time × ideal rate − total output; quality loss = total output − good output. Their sum equals planned ideal output minus good output, using consistent units. Planned breaks outside planned production time are excluded; classify setup, changeover, minor stops, reduced speed and rejects consistently to avoid double counting. When total output is zero, Q is undefined and OEE is zero. An output above theoretical capacity is rejected until units or ideal rate are corrected.

PEE — Weighted Production Equipment Effectiveness

Input factors A, P, Q are those calculated by OEE as fractions between 0 and 1. The user enters nonnegative weights summing to 100%. PEE (%) = 100 × A^(wA/100) × P^(wP/100) × Q^(wQ/100), where the entered weights are percentages. A zero-weight factor is omitted; a zero factor with positive weight makes PEE zero. Missing or undefined quality blocks PEE.

Worked example: A = 87.50%, P = 83.33%, Q = 98.00%; illustrative weights 40%, 35%, 25% produce PEE ≈ 88.49%. These are not standard prescribed weights. Because PEE uses weighted geometric aggregation rather than OEE's product, their percentage values are not directly comparable.

Applicability: For continuous processes, metres-based measurement and process-specific continuous-production models may require an extended definition. Do not use this three-factor weighting as a universal equipment benchmark. User-entered numerical values are assessments or measurements, not independently verified operational evidence.