Grounds for belief or disbelief; data on which to base proof or to establish truth or falsehood.
Note 1: Evidence can be objective or subjective. Evidence is obtained through measurement, the results of analyses, experience, and the observation of behavior over time.
Note 2: The security perspective places focus on credible evidence used to obtain assurance, substantiate trustworthiness, and assess risk
See NIST SP 800-160 Vol. 1 for detailed information.