SAP Business Workflow is a cross-application tool enabling the integration of business tasks across whole application areas. This tool is also used in many areas of SAP. 

Defination : The automation of a business process in whole or part, during which documents, information or tasks are passed from one participant to another for action, according to a set of procedural rules. Workflow uses the organization structure to determine the person responsible for executing a task..
We can view workflow development as a programming environment. The workflow development environment is a true object-oriented development environment. The basic component in workflow is a business object on which operations are carried out. These operations are implemented as methods.
(Business Application Programming Interface) are special methods implemented in the business objects. Events which are part of the business object, are triggered for changes in the state of the object.
Organizational plans:
An organizational plan represents the complete information about a company’s organization structure. The main elements of an organizational plan are as follows.
Hierarchy among various organizational units ( In a company we can have several organizational units broken down by function for example : A company can have several divisions, such as engineering, Manufacturing and Finance. )
Jobs performed in a company ( A job involves performing one or more business tasks. For example Manager, Secretary, Sales Order Clerk, Purchasing Clerk etc.)

Positions held by the organizations employees in the organization and the reporting structure.

Organizational Units :
An Organizational unit is reponsible for a specific function in a company. This units are linked in a hierarchical fashion to form the entire organization structure. 
Jobs :
Jobs represent a flexible means of identifying a user and describes a set of tasks performed by a person holding a position to which that job is assigned.

Position :

A position in a company represents a rank. Positions are linked in hierarchical fashion to represent the chain of command in a company.
Users: A user is a person who has been granted access to the SAP system to use its various functions. A user ID identifies a user in the system .
Business Objects: A business object represents a business entity that has a definite state and various properties. You can carry various functions on the objects. Several business objects are defined in the system and organized in the BOR (BUSINESS OBJECT REPOSITORY). 
Tasks : Tasks defines a piece of work that can be executed and tracked in the system technically. A task points to a method of an object.

We can create new Username by using Tcode - 'SU01' .

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