The increasing complexity of medical care environment, and medical
education and practices made understanding the principles and concepts
of training, development, and the related concepts and disciplines
necessary for doctors practicing at almost any level in a healthcare
system. The aim of this research paper is to identify and describe the
essential training knowledge needed by physicians working in the field
of professional training and development (Professional trainers) and
medical schools' instruction. These essential knowledge should include
in the content of any training of the trainer (TOT) courses conducted
for physicians.