INTRODUCTION TO UML

What is UML? 

• UML is Unified Modeling Language  
• We have already understood 'Modeling' 
• A 'Language' is a medium of communication 
• A 'Modeling Language' is a way to communicate models clearly and crisply 
• To understand why it is called 'Unified', we will look at the history of UML

History of UML 

• 1970's-1980's: Object-oriented modeling languages, a new generation of object-oriented programming languages and increasingly complex applications
• 1990's-1994: Object-oriented methods increased from 10 to more than 50 resulting in "method wars". Booch's method, Jacobson's DOSE, Rumbaugh's OMT, Fusion, Shlaer-Mellor and Coad-Yourdon methods are the most prominent methods 
• 1995-2003: Grady Booch (Rational Software Corporation), Ivar Jacobson (Objectory) and James Rumbaugh (General Electric) began to adopt ideas from one another's methods. (UML v0.8 - v1.5) 
• 2004: UML v2.0 was started

Introduction to UML

• UML has been standardized by OMG (Object Management Group) — by unification of Booch's method, Jacobson's DOSE (Object-Oriented Software Engineering) and Rumbaugh's OMT (Object Modeling Technique) at before "Rational" Software Corporation
• This unification gave birth to Unified Modeling Language (UML) 
• Several organizations contributed to the development of UML. They are: 

Hewlett- Packard Microsoft Oracle IBM Unisys