You are assigned a role to develop a new system based on the project case study. Draw a context diagram and a level-0 DFD for it.
The report is describing the Professional and Scientific Staff Management (PSSM) System. Professional and Scientific Staff Management (PSSM) provide temporary staffs to companies for some specific jobs. The report is describing the complete management system of Professional and Scientific Staff Management by using UML diagrams.
Context diagram, use case diagram, class diagram, activity diagram and sequence diagram are showing the complete process of Professional and Scientific Staff Management (PSSM) System. The basic flow of the PSSM system is being described by Context diagram while use case diagram is showing the complete behaviour of the Professional and Scientific Staff Management (PSSM) system.
The domain class model is showing the objects, classes and attributes which are being used in the Professional and Scientific Staff Management (PSSM) system. Without domain class model; the system will not be developed. Thus every model is necessary to describe and implement a good system. Activity diagram shows the workflow of every process of the entire system graphically while the system sequence diagram shows every aspect like actors, events, their order and complete flow of events of the entire system.
The Context diagram is showing the graphical presentation of the data flow of the entire system. It is the basic unit for any project analysis. It shows the scope and boundary of the entire system. (Modern Analyst Media LLC 2014)
Draw a use case diagram by using the Level-0 DFD that you provided in Task 1.Note: Your use case diagram directly relates to the information in Level-0 diagram, but it will also relate to the same system presented as in the context diagram
The domain class model is the conceptual model. The above domain class model is showing the objects, classes and attributes which are being used in the Professional and Scientific Staff Management (PSSM) system. It is describing all constrains in the system for all cases. It is not showing the solution of the problems which will occur in the PSSM system. (Scott W. Ambler, 2014).
The Activity diagram shows the complete graphical representation of workflow of all the activities in the system. It shows each and every step of the activity and shows all constrains and validations for each activity differently. The above diagram is showing all activities with all possible conditions in the Professional and Scientific Staff Management (PSSM) system. (Microsoft 2015)
Using the Activity Diagram above, produce a system sequence diagram, i.e. only include two swimlanes – one for the actor (PSSM employee) and the other for the entire system as a system class object.
The system sequence diagram shows all the actors, events, their order and complete flow of events of the system. It can show the complete flow of the use case of the system. The above diagram is showing all actors, events and their order in the Professional and Scientific Staff Management (PSSM) system. It is showing the objects required in the PSSM system and the events held between them and the order of the events in which it will occur. (Microsoft Corporation 2015)
One object is ‘Client Company’, one is ‘Contact Manager’ and another one is ‘PSSM System’, is being displayed in the above system sequence diagram. Every flow between these objects is clearly visible in the diagram which is very useful to understand the flow of the system.
The report of Professional and Scientific Staff Management (PSSM) System is defining the complete understand of the system. It is showing context diagram, use case diagram, class diagram, activity diagram and sequence diagram.
Every class, object and attributes which are necessary to implement the system are defined by class diagram and every case which can be occur to implement the best system is defined in the report.
The new system has some changes than previous system. In new system, the right to update the database will be given to only one person to escape data mismatch in the system. Thus every person has no right to update database like previous system which was the major reason of degradation of the system but the new proposed system is eliminating this drawback and improving the performance.
 Microsoft Corporation, D 2015, Create a UML Sequence Diagram, viewed 9th Jan 2015
 Microsoft, D 2015, UML Activity Diagrams: Guidelines, viewed 9th Jan 2015  Modern Analyst Media LLC, D 2014, Interviews Questions for Business Analysts and System Analysts, viewed 9th Jan 2015
 uml-diagrams.org, D 2014, UML Use Case Diagrams, viewed 9th Jan 2015
 Scott W. Ambler, D 2014, UML2 Class Diagrams: An Agile Introduction, viewed 9th Jan 2015
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