The Admiralty System or NATO System is a method for evaluating collected items of intelligence

Intelligence (information gathering)

Intelligence assessment is the development of forecasts of behaviour or recommended courses of action to the leadership of an organization, based on a wide range of available information sources both overt and covert. Assessments are developed in response to requirements declared by the leadership...

. The system comprises a two-character notation assessing the reliability of the source and the assessed level of confidence on the information. The Admiralty system is used by NATO member nations and members of the AUSCANZUKUS

UKUSA Community

The United Kingdom – United States of America Agreement is a multilateral agreement for cooperation in signals intelligence among the United Kingdom, the United States, Canada, Australia, and New Zealand. It was first signed in March 1946 by the United Kingdom and the United States and later...

 community.
Evaluation occurs in the processing stage of the intelligence cycle recognising that collected information cannot be accepted at face value.