Pool Setup

{% cut "I want to calculate a skill based on performance in multiple projects. Is that possible? If it is, can I use “Aggregation by skill”?" %}

If you mean multiple different projects, you can't do that.

You can merge all the projects into one and use **History size** in the quality control rules. See examples in the [Control tasks](../../../../guide/concepts/goldenset.md) section.

You can use **Aggregation by skill**, but you'll need to list all the possible values, which is probably not the best choice. Perhaps you'll find [another method of aggregation](../../../../guide/concepts/result-aggregation.md) helpful.

{% endcut %}