Different experts in the respective field delivered the lecture on several important aspects of the clinical trial. Training was given on rule and regulation of Clinical Trail practices, different types and phases of clinical trials were explained. Variety of methods explained for inclusion and exclusion criteria for randomized clinical trials.  Aspects of protocol development regarding its design, appropriate methodology and important statistical aspects were considered. There were also detailed lectures and discussion on Good Clinical Practice (GCP) guidelines to develop the capacity of the attendants regarding ethical and scientific quality standards of conducting clinical trials. Furthermore, detailed information provided regarding the design, performance, monitoring, auditing recording and reporting of the clinical trials in addition to the right of the trial subject. Development method for Case Report Form (CRF) was explained highlighting main objective in preserving and maintaining a quality of data along with data integrity. In the end, information regarding Iranian Registry of Clinical Trials (IRCT) (http://www.irct.ir/) was explained to the attendants. IRCT is the primary registry in the WHO Registry Network set up with the help from Ministry of Health and Medical Education (MOHME) and hosted by Iran University of Medical Sciences (IUMS).  In conclusion, it was the active interactive learning session for capacity development regarding the clinical trials.