Methodologies set out detailed procedures for quantifying the plastic waste collected and/or recycled as the result of a project activity and provide guidance to help project developers determine project boundaries, set baselines and assess additionality.

Project proponents must always use the current and valid version of a methodology. From time to time, a methodology may be revised, withdrawn or put on hold. Select from the methodologies below based on the nature of your project activity.

To ensure that the Plastic Program remains robust and credible, the Plastic Program periodically reviews approved methodologies to ensure that they conform to current requirements, international best practices and scientific consensus. During this process, if it is determined that a methodology must be updated, revised or withdrawn, a grace period will apply for projects currently using the methodology. The status of each methodology is always displayed on the methodology page of the website.

Other Programs

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