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Some important things to know:
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Data quality at Open Food Facts is guided by '''3 main principles''':
* Quality does not make sense for itself.
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* Quality does not make sense for itself: quality depends on usages.
* Quality depends on usages.
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* We always try to favor ease of use and ease of collection. Data quality control, data verification and data fix should never be an obstacle to data gathering.
* No database at all can pretend to zero-default.
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* No database at all can pretend to be zero-defect. With more than 2,900,000 products, there are quality concerns. Data quality is done on a "best effort" basis. The effort on data quality includes measuring quality, setting objectives, publishing them and implementing them.
* With more than 1 200 000 products, there are quality concerns: our goal is to lower the impacts of the issues.
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These principles and our high level objectives are described in the following short document, which you should read at first if you want to go further:
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== Data quality: how to help? ==
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https://link.openfoodfacts.org/data-quality  
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=== Nutri-Score quality ===
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== Measures ==
Some products now have Nutri-Score printed on the front of pack. Some differs from our Nutri-Score calculation. We should take care about that:
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We have started an initiative to measure and publish continuously some data quality stats. We have created a specific page dedicated to [[data quality stats]].
* [https://world.openfoodfacts.org/nutrition-grade/e/label/nutriscore-grade-a Nutri-Score printed A but calculated E]
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* [https://world.openfoodfacts.org/nutrition-grade/d/label/nutriscore-grade-a Nutri-Score printed A but calculated D]
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== How to help? ==
* [https://world.openfoodfacts.org/nutrition-grade/c/label/nutriscore-grade-a Nutri-Score printed A but calculated C]
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Anyone can help to improve the data quality.
* [https://world.openfoodfacts.org/nutrition-grade/a/label/nutriscore-grade-e Nutri-Score printed E but calculated A]
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* [https://world.openfoodfacts.org/nutrition-grade/b/label/nutriscore-grade-e Nutri-Score printed E but calculated B]
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=== 1. Adding photos ===
* [https://world.openfoodfacts.org/nutrition-grade/c/label/nutriscore-grade-e Nutri-Score printed E but calculated C]
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Photos allow other contributors to verify and, if necessary, fix the issues. As a contributor, this is the first step to improve data quality.
* [https://world.openfoodfacts.org/nutrition-grade/a/label/nutriscore-grade-d Nutri-Score printed D but calculated A]
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* [https://world.openfoodfacts.org/nutrition-grade/b/label/nutriscore-grade-d Nutri-Score printed D but calculated B]
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=== 2. Fixing a product issue ===
* [https://world.openfoodfacts.org/nutrition-grade/c/label/nutriscore-grade-d Nutri-Score printed D but calculated C]
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As in Wikipedia, anyone can edit at Open Food Facts. If you see an error, don't hesitate to fix it! If you're afraid or hesitating, you can ask your questions on [https://forum.openfoodfacts.org the forum] or in our [https://slack.openfoodfacts.org/ Slack space].
* [https://world.openfoodfacts.org/nutrition-grade/e/label/nutriscore-grade-b Nutri-Score printed B but calculated E]
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* [https://world.openfoodfacts.org/nutrition-grade/d/label/nutriscore-grade-b Nutri-Score printed B but calculated D]
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=== 3. Report an issue related to many products or related to data quality ===
* [https://world.openfoodfacts.org/nutrition-grade/c/label/nutriscore-grade-b Nutri-Score printed B but calculated C]
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Sometimes you can discover issues related to many products or related to data quality.
There are many reasons why it can differ:
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* the label in Open Food Facts does not represent the label printed on the package (easy to solve)
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* You can report the issue on [https://forum.openfoodfacts.org the forum] or in our [https://slack.openfoodfacts.org/ Slack space].
* the label is correct but our calculation doesn't provide the same result:
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* You can also directly [https://github.com/openfoodfacts/openfoodfacts-server/issues/new/choose report the issue directly on our bug reporting tool].
** check the category,
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** then check the nutrition facts: the issue is sometimes the lack of "fibers" information or the lack of "Fruits, vegetables, nuts and rapeseed, walnut and olive oils" percentage.
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=== 4. Help improve data quality with specific missions ===
* it can be a software issue (quite rare but possible)
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If you want to further, you can check [[Data quality missions|specific missions related to data quality]]. Some missions are fast and easy to achieve.  
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=== 5. Joining the effort to improve data quality ===
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We organize a public monthly meeting dedicated to data quality. It takes place every first Tuesday of the month at 6pm CET, see [[Events|Open Food Facts' events]] to find the next meetings in our community calendar.
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If you have '''technical skills''', you can also do your part for data quality. Head over to [https://github.com/openfoodfacts/openfoodfacts-server/issues/5538 our tracking issue on GitHub]
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== Tools ==
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[to be completed]
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=== Data quality measurement ===
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See [[data quality stats]].
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=== Quality facets ===
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[to be described]
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=== Data quality daily ===
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[https://mirabelle.openfoodfacts.org/-/data-quality-daily/subscribe Data quality daily] is a daily email suggesting you 3 Open Food Facts products to fix.
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* this is ''your'' mission, these 3 products are not sent to other users
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* these products should be fixable (photos)
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* products' popularity is taken into account (number of scans last year): your fixes have a higher impact
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* you also get nice daily stats about data quality, including a contributors' board.
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Don't hesitate to [https://mirabelle.openfoodfacts.org/-/data-quality-daily/subscribe register], you can unsubscribe at any time.
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=== Power User Script ===
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[https://github.com/openfoodfacts/power-user-script Power User Script] is a user script for your browser, to empower Open Food Facts  contribution. It offers many enhancements for contributors, and many features dedicated to data quality.
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== Reference / documentation ==
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=== Quality facets ===
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There are more than 180 data quality facets. You can consult the [[List of data quality errors (generated)|list of data quality errors]].
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=== Data quality issues which can't be fixed ===
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Some data quality issues can't be fixed due to different reasons. See the dedicated page: [[Data quality issues which can't be fixed]].
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[[Category:Quality]]
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[[Category:Data quality]]
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