§ 2302 Establishment of basic fact.

Here's a plain English summary of this rule:

Before a legal presumption can apply in a case, there has to be some basic fact behind it. This rule explains the different ways that basic fact can be proven or accepted in court.

There are four ways this can happen. The fact can be stated in the written documents filed in the case, like a complaint or answer. It can also be agreed upon by both sides through a stipulation, meaning everyone agrees the fact is true so no one has to prove it. A judge can also accept the fact through judicial notice, which means the fact is so well known or obvious that it doesn't need formal proof. Finally, the fact can be shown through evidence presented during the case, like witness testimony or documents.

In short, this rule gives courts flexibility in how a basic fact gets established. It does not require one specific method. As long as the fact is shown through one of these four ways, it can support a legal presumption in the case.