In a legal dispute, the defendant is initially presumed to be innocent, while the prosecution has the responsibility of producing evidence persuasive enough to establish any guilt. This evidence is known as the Burden of Proof.
In a debate, The Proposition has the Burden of Proof (rather than the opposition).

The Proposition Team sets the scene, explains the problem and states why the motion is the solution.
Then the team defines the terms of the motion - the opposition has to respond to this definition and provide a clash of arguments.

Some teams use of IDEAS for a claim that supports the motion:

I - Introduce: what's the problem and why your audience should support the motion as the solution?

D - Define:
a) what does the motion mean and
b) what is it specifically that you believe or want to do?
You must define it clearly for your audience.

E - Explain: is there a problem? Is there a viable solution? What's the likely outcome?

A - Analyse: analyse the argument that is most central to the debate; provide evidence (quantitative) and logical reasoning.

S - Summarise: conclude what you have proved to your audience.

Reference: Tony Koutsoumbos, https://ourdebatingsociety.wordpress.com