A Bilan Carbone® shall quantify an organisation's emissions over a time interval called the temporal boundary of the approach.
The temporal boundary of a Bilan Carbone® is conventionally one year, in order to best reflect the organisation's activity as a whole.
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A Bilan Carbone® can also cover a specific period: the analysis then focuses on the duration of an event or a project, in order to provide decision 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 take place over several years and the Bilan Carbone® then includes all the associated data and emissions from the years of the project.
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> :mag\_right: *To express the Bilan Carbone® in coherence with* [*analytical carbon accounting*](/methode-bilan-carbone-r-en/appendices/bibliography.md#guides-pratiques-de-comptabilisation)*, the temporal boundary considers a complete financial year, best reflecting the organisation's activity as a whole.*
> :mag\_right:*If the Bilan Carbone® must be used for reporting of the* [*Regulatory GHG Assessment*](/methode-bilan-carbone-r-en/appendices/bibliography.md#autres-standards-normes-et-reglementations-de-comptabilisation-des-emissions-de-ges)*, the temporal boundary considered shall be one year (the '*[*reporting year*](/methode-bilan-carbone-r-en/appendices/glossary.md#a)*).*
***
*Do you have a comprehension question?* [*Consult the FAQ*](/methode-bilan-carbone-r-en/appendices/faq.md)*. The method is living and therefore likely to evolve (clarifications, additions): find the* [*track of changes here*](/methode-bilan-carbone-r-en/foreword/history-and-tracking-of-changes.md)*.*
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