SOP is an operation, unique to the management of each business organization, that describes the required tasks to complete jobs in accordance with business and provincial regulations as well as with personal requirements for managing business activities.
In a production environment, the clear example of an SOP is the step by step production line processes used in producing the merchandise and in conducting training for workers. An SOP, in reality, defines the existence of quality standards and practices in all business organizations.
SOPs play an essential role in business organizations. SOPs are standard guidelines and procedures needed in business processes, including the marketing and administration aspects of business organizations to make sure business success will be achieved.
You may also want to consider this; http://www.research.va.gov/vacentralirb/sop/