# 4.4 - Method for estimating uncertainties

<figure><img src="https://2689238369-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FGBSULMB7RDjF3KmSrnc9%2Fuploads%2Fw85TEFI5x62lZW7oIAWY%2F555.jpg?alt=media&#x26;token=f16ad69f-a23f-44bb-a916-d6a9d4d52897" alt="" width="563"><figcaption><p>Source: Freepik</p></figcaption></figure>

This subsection details what an uncertainty is, [why](https://www.bilancarbone-methode.com/methode-bilan-carbone-r-en/4-accounting/4.4-method-for-estimating-uncertainties/4.4.1-why-uncertainties) these are an integral part of the Bilan Carbone® method, and [how](https://www.bilancarbone-methode.com/methode-bilan-carbone-r-en/4-accounting/4.4-method-for-estimating-uncertainties/4.4.2-how-should-they-be-determined) to estimate them, whether qualitatively or quantitatively:&#x20;

* [4.4.1 - Why uncertainties?](https://www.bilancarbone-methode.com/methode-bilan-carbone-r-en/4-accounting/4.4-method-for-estimating-uncertainties/4.4.1-why-uncertainties)
* [4.4.2 - How to determine them? ](https://www.bilancarbone-methode.com/methode-bilan-carbone-r-en/4-accounting/4.4-method-for-estimating-uncertainties/4.4.2-how-should-they-be-determined)

{% hint style="info" %}
As a reminder, emissions from each emission source of the organisation are estimated as follows:

Emission from a source = [Activity data](https://www.bilancarbone-methode.com/methode-bilan-carbone-r-en/4-accounting/4.2-method-for-collecting-activity-data) x [emission factor](https://www.bilancarbone-methode.com/methode-bilan-carbone-r-en/4-accounting/4.3-method-for-selecting-emission-factors) = [result](https://www.bilancarbone-methode.com/methode-bilan-carbone-r-en/4-accounting/4.5-emission-profile) ± [higher](https://www.bilancarbone-methode.com/methode-bilan-carbone-r-en/4-accounting/4.4-method-for-estimating-uncertainties)
{% endhint %}

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*Do you have a comprehension question?* [*Consult the FAQ*](https://www.bilancarbone-methode.com/methode-bilan-carbone-r-en/appendices/faq)*. The method is living and therefore likely to evolve (clarifications, additions): find the* [*track of changes here*](https://www.bilancarbone-methode.com/methode-bilan-carbone-r-en/foreword/history-and-tracking-of-changes)*.*