We can define the primary duty of consultants as the transfer of the knowledge and skills possessed by individuals or persons specialized in a particular field to organizations within a specified time frame.
Project management is the entirety of activities to be carried out to ensure that multiple stages are concluded in accordance with the desired purpose within a specified timeframe.
Consultancy is a field of activity that began to develop in industrialized countries of the early 20th century, such as America and England, and gradually spread to other countries as well.