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There have been created 3 types of UML diagrams out of various other types 1.Use Case 2.Flow 3.Sequence Use Case Diagram:- A use case diagram at its simplest is a representation of a user's interaction with the system that shows the relationship between the user and the different use cases in which the user is involved. Here an example of online shopping is considered for use case An online shopping basically will have lot more actors in the system since this a primitive model ,three actors are considered. a.Customer-The one who requests for the products online b.Admin -The owner who takes in the online bookings c.Delivery boy-This person acts as a mediator b/w the customer and the admin. The use case considered represents the interaction between the mentioned above 3 actors.

Data flow diagram:- Data flow diagrams are used to graphically represent the flow of data in a business information system. In the data flow diagram there is flow of data between 3 end points a.Customer b.admin c.Delivery boy

Customer sends/receives data on *Selected quantities *Selected products *Payment details *Receives payment conformation *Order details *receives order confirmation

Admin sends/receives data on *Order placed details *Quantities required *payment details *Order confirmation

Delivery Boy *Receives details of customer and ordered products

Sequence Diagram A sequence diagram shows object interactions arranged in time sequence. It depicts the objects and classes involved in the scenario and the sequence of messages exchanged between the objects needed to carry out the functionality of the scenario. The considered Sequence Diagram has 3 checkpoints the sequence diagram is about student enrolling for a course there are 3 objects Students,Seminar,Course it involves all the interactions between theses objects.