> For the complete documentation index, see [llms.txt](https://hypercerts.gitbook.io/hypercerts-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hypercerts.gitbook.io/hypercerts-docs/lexicons/hypercerts-lexicons/measurement.md). # Measurement ## Description A measurement is a quantitative observation that can be attached to any claim in the hypercerts graph—an activity, outcome, evaluation, or even another measurement. Measurements are designed to make structured data reusable across actors and applications, while not implying causality, attribution, or a single “true” interpretation. At their core, measurements capture what was measured, the value, the unit, and the time range of the observation. They can optionally include who produced the data (contributors), how it was produced (method type + URI), supporting resources, and location information. Measurements provide inputs for analysis and later evaluation. They help ground discussion in observable signals, but leave judgment—how to interpret the data, what it means, and what it implies for funding or recognition—to plural evaluations and domain-specific frameworks. ## Lexicon **Lexicon ID:** `org.hypercerts.claim.measurement` **Description:** **Key:** `tid` | Property | Type | Required | Description | Comments | | ----------------------- | -------- | -------- | ----------------------------------------------------------------------------- | ----------------------------------------------------------------------------------- | | `activity` | `ref` | ❌ | A strong reference to the activity that this measurement is for | The record referenced must conform with the lexicon `org.hypercerts.claim.activity` | | `measurers` | `array` | ✅ | DIDs of the entity (or entities) that measured this data | | | `metric` | `string` | ✅ | The metric being measured | | | `value` | `string` | ✅ | The measured value | | | `measurementMethodType` | `string` | ❌ | Short identifier for the measurement methodology | | | `measurementMethodURI` | `string` | ❌ | URI to methodology documentation, standard protocol, or measurement procedure | | | `evidenceURI` | `array` | ❌ | URIs to supporting evidence or data | | | `location` | `ref` | ❌ | A strong reference to the location where the measurement was taken | References must conform to `app.certified.location` | | `createdAt` | `string` | ✅ | Client-declared timestamp when this record was originally created | | --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://hypercerts.gitbook.io/hypercerts-docs/lexicons/hypercerts-lexicons/measurement.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.