> For the complete documentation index, see [llms.txt](https://www.bilancarbone-methode.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-methode.com/english/2-scope-of-the-approach/2.3-perimetre-temporel.md).

# 2.3 - Temporal boundary

<figure><img src="/files/m1yWhagl85QoM6MzDrEL" alt="" width="563"><figcaption><p>Source: Pexels</p></figcaption></figure>

A Bilan Carbone® must quantify an organisation's emissions over a time interval called the temporal boundary of the approach.

The temporal boundary of a Bilan Carbone® is classically one year, in order to best reflect the organisation's overall activity.

{% hint style="info" %}
A Bilan Carbone® can also cover a particular period: the analysis then focuses on the duration of an event or a project, in order to provide decision-making support. It is possible to carry out the Bilan Carbone® of an event "in real time", or to study the GHG dimension of several scenarios of the same project by choosing the appropriate organisational, operational and temporal boundaries.

Example: construction projects may span several years and the Bilan Carbone® then integrates all the associated data and emissions from the years of the project.
{% endhint %}

> :mag\_right: *To express the Bilan Carbone® consistently with* [*analytical carbon accounting*](/english/annexes/bibliographie.md#guides-pratiques-de-comptabilisation)*, the temporal boundary considers a complete accounting period, best reflecting the organisation's overall activity.*

> :mag\_right:*If the Bilan Carbone® is intended to serve the reporting of the* [*mandatory BEGES-R*](/english/annexes/bibliographie.md#autres-standards-normes-et-reglementations-de-comptabilisation-des-emissions-de-ges)*, the temporal boundary considered must be one year (the* [*reporting year*](/english/annexes/glossaire.md#a)*).*

***

*Do you have a question of understanding?* [*Consult the FAQ*](/english/annexes/faq.md)*. The method is a living document and therefore subject to change (clarifications, additions): find the* [*change log here*](/english/readme/historique-et-suivi-des-modifications.md)*.*