expanded, with example
In certain types of a dispute the ''[[status quo]]'' is often accepted as the norm, and defenders of the norm need not prove that it is true. Challengers to the norm have the burden of proof.
In polite debate, the person making an assertion carries the burden of proof - after all, no debate can begin unless the person provides ground for debate. Without evidence provided, an assertion can generally be rejected out of hand.
In some forums, the burden of proof is reversed, and an assertion is allowed to stand unless disproof is offered. Complaints against this sort of thing in jurisprudence led to the American standard of "[[innocent until proven guilty]]."