# Release cycle

Impact measurement is a maturing field where **methodology is actively developed**. To offer the most up-to-date information to users, Upright regularly makes available new releases of Upright data.

## Model release process

Three types of releases are available for logged-in users:

1. Latest releases (`latest`)
2. Current stable release (`stable`)
3. Previous stable releases

The `latest` release may receive targeted updates and fixes to company product information, other company disclosures or the exact product information used to quantify the net impact of a company. After thorough testing and validation, `latest` is released as the current stable release. A new `latest` release is then created, reflecting the latest work in net impact quantification, regulatory methodology and other components of Upright’s results. The `latest` release is available to anonymous users and is selected by default for logged-in users.

The current stable release is recommended for most use cases that require results remaining immutable. Previous stable releases remain available for logged-in users to allow for managed transitions. When a new latest release is released, material changes in results since the previous stable release are summarized in the Release notes of the release. By convention, stable releases follow a numbering scheme in the format `x.y.0`.

{% hint style="info" %}
**Using previous stable releases**

Previous stable releases are useful for verifying how results looked back in time, for example when figures were last time reported. 

Users of Upright data may themselves determine when is the most appropriate time for them to migrate to new data releases.
{% endhint %}

## Reasons for changes in results

Upright results change for three underlying causes. 

1. Changes to **input data** (e.g., integration of nutritional values or addition of new value chain links)
2. Changes in **definition and methodology** (e.g., delegated act to EU taxonomy that includes nuclear power and natural gas as potentially taxonomy aligned) 
3. Changes to **companies themselves** (e.g., product revenue mix information)

Release notes have more detailed information about result changes between two stable releases. 

{% hint style="info" %}
**Restated annual time series data for companies**

Upright is working to provide restated time series data for companies. Once this is available, each release will contain a *restated* annual time series for each company in which changes across time will reflect only changes to the companies themselves.

Restatements can give answers to questions like "*how does the impact of a company develop during 2005-2022, based on the current best understanding of impact measurement*"

For more information, contact your Customer Success Manager or Sales Representative.
{% endhint %}


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