Source: IATA
Here’s the latest (2024) edition of the IATA guidance material for CBTA.
The manual emphasises what competency assessment is and how to conduct pilot performance assessment for instructors, incorporating best practice for the method and assessment processes.
Follow the link here to a downloadable PDF of the 3rd edition (2024) of the guidance material: https://www.iata.org/contentassets/c0f61fc821dc4f62bb6441d7abedb076/competency-assessment-and-evaluation-for-pilots-instructors-and-evaluators-gm.pdf#page10