Burden of Proof

Who must prove what? Burden of proof answers that question. The party making a claim bears the obligation to support it with evidence. The party defending the status quo or denying the claim does not have to prove a negative. In criminal law the state must prove guilt beyond reasonable doubt; the accused need not prove innocence. In civil litigation the plaintiff must show the preponderance of evidence. In science the claimant must supply reproducible evidence; sceptics need only point to gaps or counterexamples. Shifting the burden — demanding that others disprove your assertion — is a rhetorical move, not a logical one.

The default matters. If the default is "innocent until proven guilty," the cost of wrong conviction is weighted heavily and the burden sits on the accuser. If the default is "guilty until you prove otherwise," the system is stacked the other way. In organisational life the default is often implicit: "we keep doing this until someone proves it's broken" versus "we change nothing until someone proves the new way works." Whoever sets the default shapes where the burden lies and who must marshal evidence. The strategic question is always: what is the default here, and who benefits from it?

The burden scales with the claim. Extraordinary claims require extraordinary evidence. "The meeting is at 3pm" needs a calendar entry. "This drug cures cancer" needs randomised trials. "Markets are always efficient" needs more than a few decades of data. Calibrating burden to the stakes and the strangeness of the claim prevents both credulity and paralysing scepticism. The discipline is asking: what would it take to convince a reasonable sceptic? If the answer is "nothing would," the burden has been misplaced.