A more thorough explanation:

Definition: Proper improbation is a legal action taken in Scottish law to prove that a document is false or forged.

For example, if someone suspects that a will is not genuine, they can take proper improbation to prove that it is a forgery. This legal action is used to challenge the authenticity of a document and to prevent it from being used in court.

Another type of improbation is reduction improbation. This is when a person who may be affected by a document can demand its production in court. They can ask the court to determine the document's effects or to nullify it if it is found to be false or forged. If the document is not produced, the court can automatically declare it false or forged.

For example, if a person believes that a contract they signed is not valid, they can take reduction improbation to challenge its authenticity. This legal action is used to protect individuals from being harmed by false or forged documents.