Certification is a process of verifying that an individual has the necessary qualifications or skills to perform a certain job. It is usually done through a series of tests, interviews, and other assessments. The term 'certification' can refer to the process itself, or to the document that is issued as PROOF of the successful completion of the process. In this crossword, five words are used to describe the concept of certification: AFFIRMATION (11 letters), CERTIFICATE (11 letters), PROOF (5 letters), ADMISSION (9 letters), and EVIDENCE (8 letters). AFFIRMATION is an act of confirming or asserting something, while a CERTIFICATE is a document that serves as EVIDENCE of a qualification or achievement. PROOF is a type of EVIDENCE that supports a claim, while ADMISSION is an acknowledgment of something. Lastly, EVIDENCE is any type of information that can be used to support a claim.