A more thorough explanation:

Productio sectae is a Latin term used in common-law pleading. It refers to the plaintiff's responsibility to provide evidence that supports the claims made in the declaration.

For example, if a plaintiff files a lawsuit claiming that the defendant breached a contract, the plaintiff must provide evidence such as the contract itself, emails or letters between the parties, or witness testimony to prove that the breach occurred. This evidence is necessary to satisfy the burden of productio sectae.

In another example, if a plaintiff sues for damages resulting from a car accident, the plaintiff must provide evidence such as police reports, medical records, and witness statements to prove that the defendant was at fault and caused the plaintiff's injuries.

These examples illustrate how productio sectae requires the plaintiff to provide evidence that supports the claims made in the lawsuit.