← Back to catalogue
Research draft

measurement

vr.tr.measurement · ACT.ACT

Let an agent treat measurements as results with value, unit, method, uncertainty and traceability, and never report a number without its unit and source.

Thing Registry Activities and processes

Research draft, second pass

A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.

written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify

Researched by: Claude

Purpose and description

Let an agent treat measurements as results with value, unit, method, uncertainty and traceability, and never report a number without its unit and source.

The process of determining the magnitude of a quantity by comparison with a standard, using instruments and methods, with a result expressed as a value, unit and uncertainty.

What it is for: Knowing quantities reliably for science, trade, health and engineering.

It can be measure, with calibrated instruments; estimate uncertainty; calibrate instruments against standards; report results with units and uncertainty.

Distinguishing features

Compares with a standard

Has uncertainty

Traceability links to SI units

Rating systems are assessments, not physical measurements

What it looks like

Instruments, readings, certificates and data tables.

How it is recognised

Values with units and uncertainty

Calibration certificates

Tests such as hardness tests and gauges

Related models

produces - result

quantity value

uses - tools

instrument

is governed by - science

metrology

is confused with - less rigorous

estimation

In practice

Families and kinds

physical measurements

chemical and biological analyses

tests such as hardness tests

surveys and ratings (in a looser sense)

Identifiers

calibration certificate number lab-specific traceability

Standards and regulation

SI Brochure

ISO/IEC Guide 98-3 (GUM)

ISO/IEC 17025 for laboratories

Legal metrology law for trade

Failure modes and hazards

Missing units or uncertainty

Uncalibrated instruments

Measurement bias

Also called

wow and flutter measurementhardness testchain wear gaugemeridian linehypsometric tintsrating systemacademic grading systemvideo game difficultycharacter difficultyflame spreadmedical scaleJefferson Scale of Physician Empathyphotometryall-cause mortalitytrauma severity indicestest anxiety scalespectrophotometrycolorimetrynephelometry and turbidimetryluminescent measurementtensile testingphotometric systemmicro-spectrophotometryaction spectruminfrared spectrophotometryatomic spectrophotometryBiaxial tensile testingbiomonitoringtareoscillometryair quality indexAmbient Air Quality IndexSatellite-to-Satellite TrackingFertility testingNon-invasive intracranial pressure measurement methodsmolecular measurementwave measurementdistance from citydirect measurementindirect measurement

+124

Where this came from

wikidata · CC0 1.0

Source repository Registry entry point

Also registered as vr.tr.measurement

Drafted structure

Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.

Result Value and unit.

A result without unit is meaningless.

Value

Number and unit.

Value

Result.

  1. What is the measured value and unit? measurement
  2. What is the uncertainty? measurement

Measurand

What was measured.

Measurand

The quantity.

  1. What exactly was measured? definition
  2. Under which conditions? definition
Method How it was measured.

Method decides quality.

Instrument

Tool.

Instrument

Instrument and calibration.

  1. Which instrument was used, and is it calibrated? provenance
  2. When was it last calibrated? provenance

Procedure

Standard method.

Procedure

Method standard.

  1. Which standard procedure was followed? provenance
  2. Were there deviations? boundary
Quality Traceability and competence.

Traceability makes results comparable.

Traceability

To SI.

Traceability

Traceability chain.

  1. Is the result traceable to SI units? provenance
  2. Through which laboratory? provenance

Competence

Accreditation.

Accreditation

Lab accreditation.

  1. Is the laboratory accredited? provenance
  2. For this measurement? boundary
Use Decisions based on results.

Decisions need fit-for-purpose measurements.

Decision

Conformity.

Conformity

Conformity decision.

  1. Does the result show conformity with the requirement? boundary
  2. How is uncertainty taken into account? definition

Reporting

Communication.

Reporting

How to report.

  1. How should the result be reported? action
  2. What caveats apply? boundary

What the second pass must settle

  • Should measurement kinds be separate entries?
  • How should uncertainty be recorded consistently?
  • How should ratings be separated from physical measurements?
Draft as JSON