> For the complete documentation index, see [llms.txt](https://www.bilancarbone-conformite.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.bilancarbone-conformite.com/compliance-framework/compliance-referentials/chapitre-d-transparence-de-la-methodologie-des-sources-et-formation/critere-d.2-sources-de-donnees-utilisees.md).

# Criterion D.2 - Data sources used

As mentioned in [criterion A.10](/compliance-framework/compliance-referentials/chapitre-a-cadre-technique-et-methodologique/critere-a.10-coherence-des-fe-et-des-versions-des-sources-de-donnees.md), the data used in the candidate tool may come from very different sources: databases specific to a sector of activity, studies relating to a particular element (product, equipment, technique…), expert opinions, etc. Not all of these data sources are of equivalent quality, and for each of them, it is necessary to verify transparency, reliability and currency.

The methodological points (reliability and currency) having been detailed in [criterion A.10](/compliance-framework/compliance-referentials/chapitre-a-cadre-technique-et-methodologique/critere-a.10-coherence-des-fe-et-des-versions-des-sources-de-donnees.md), only the transparency of these data sources will be analysed here. More specifically, it will be analysed to what extent the tool is transparent about activity data (value, unit, source) and about the emission factors used, by being clear about its label, its value, its version and its source database in the case of EFs derived from "conventional" databases.

In the case of consolidated EFs, it will also be expected that the candidate tool makes accessible all the technical values (primary data, assumptions, etc.) that were used in their construction.

#### Criterion

<table data-header-hidden><thead><tr><th width="136"></th><th></th></tr></thead><tbody><tr><td><mark style="color:red;"><strong>Mandatory</strong></mark></td><td><strong>Criterion D.2 - Data sources used</strong></td></tr><tr><td><strong>Question</strong></td><td>Are the sources and values of all emission factors and all technical values usable in the candidate tool clearly identified and accessible to users? Is it also possible to trace the version of the database and/or the value used?</td></tr><tr><td><strong>Responses</strong></td><td><ul><li><mark style="color:green;"><strong>Yes, it is possible to identify both the source and the version of an EF within the candidate tool</strong></mark></li><li><mark style="color:green;"><strong>Yes, it is possible to identify both the source and the version of an EF via an export of the candidate tool's data</strong></mark></li><li><mark style="color:green;"><strong>Yes, it is possible to identify both the source and the version of an EF through resources provided by the organisation behind the candidate tool</strong></mark></li><li><mark style="color:red;"><strong>No, it is not possible to identify the source and version of the EFs used by the candidate tool</strong></mark></li></ul></td></tr><tr><td><strong>Implementation guidance</strong></td><td><p>Look in the user guide, the methodological guide and/or the manual to check whether the data sources are clearly identified</p><p>Look in the candidate tool for a database listing the sources used for each value or factor added to the candidate tool</p></td></tr></tbody></table>


---

# 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:

```
GET https://www.bilancarbone-conformite.com/compliance-framework/compliance-referentials/chapitre-d-transparence-de-la-methodologie-des-sources-et-formation/critere-d.2-sources-de-donnees-utilisees.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
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.