What a document actually demonstrates

A payslip proves employment. It proves nothing about competence.

Applicants supply what they have, and what they have is mostly evidence of employment: contracts, payslips, position descriptions, references confirming dates and duties. None of these demonstrates performance. They establish that a person occupied a role in which the work was presumably done, which is a reasonable starting inference and is not assessment evidence.

The evidence that carries weight shows the person doing the thing: work products they produced, records they completed, observations by a supervisor of specific performance, photographs or recordings of the work with enough context to identify who did it. Each of these is about performance rather than about position.

The distinction is worth explaining to applicants explicitly, because they usually assume the opposite. A person who has been told to bring proof of their experience will bring employment documents, and the resulting gap is read as a weak application when it is a briefing failure.

Where the strongest evidence is confidential or belongs to an employer, that is a genuine constraint. Redaction, employer-verified summaries and direct third party confirmation are the usual routes, and they need to be arranged rather than left to the applicant to solve.

It is worth adding that the strongest evidence in many applications is something the applicant does not think of as evidence at all. A folder of work they kept because they were proud of it, photographs taken for an unrelated reason, or records they maintained for their own purposes are frequently better than anything they would have submitted, and they surface only if somebody asks what they have kept.