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Yook PCF Methodology

Accuracy Score

To make the limitations due to data quality and availability visible and to avoid underestimation of CO2e emissions, Yook has developed the Accuracy Score.


The Accuracy Score developed by Yook reflects the completeness and quality of the input data at product and emission factor level (foreground and background data). The Accuracy Score thus creates transparency and is intended to avoid underestimation of the PCF.
It also provides the basis for determining the Safety Margin and is composed of a weighted average of the three components: Availability Score, Reliability Score, and Precision Score. The Accuracy Score is continuously developed by Yook.
Product Description: Accuracy Score by Yook
Availability Score
Reliability Score
Precision Score
Reflects availability/ quality of foreground data (provided by/ extracted from shop)
Reflects quality of the source of EFs/ background data
Reflects quality of the matching of foreground and background data

Availability Score

The Availability Score refers to the product data and reflects the availability and quality of the foreground data, which is provided, extracted and, if necessary, supplemented with the help of industry- and product-specific assumptions. The main influencing factors are product weight and material composition, production location, and other product-specific manufacturing characteristics, as well as transport and packaging information.
It is calculated based on the % - contribution of each life-cycle stage to the overall PCF and the data availability and quality of the main impacting factors in each stage.

Reliability Score

The reliability score refers to the emission factors and reflects the availability and quality of the background data, which is collected and harmonized by Yook. Based on the type and assessment of the source of the background data, the reliability of the emission factor is thus estimated. The assessment takes into account whether the source is independently verified and transparent about the underlying assumptions.
It is calculated based on the type and evaluation of the source of the emissions factor/ background data.

Precision Score

The Precision Score reflects the degree to which foreground and background data match, and thus represents how well the emission factors match the product data. The evaluation of this is done on three levels:
--> Technical representativeness (matching of product and emission factor flow)
--> Time representativeness (matching of time validity of the emission factor)
--> Geographical representativeness (matching of geographical validity of the emission factor)

Safety Margin

The Safety Margin is the factory by which the PCF is increased in order to control for uncertainty. It is determined using the Accuracy Score and then applied to the calculated phases of the PCF.
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