They can be considered as the descendent of Entity Relationship Diagrams ERD’s They show the classes of the system and their operations and attributes A class model can be consisted of one or more class diagrams Analysis Class Diagrams can be useful in systems analysis and design to understand the requirements of the problem domain and identify the components define relationships between entities clarify and define the static structure of the models and the classes show the behaviour of one or more classes describe what objects do and what services they provide and many more Class Diagram for Record New Tour use case Tour is an entity and it has the following attributes 1 tour name as T_name string 2 tour type as T_Type string 3 description as description string 4 start date as Start_date string 5 duration as duration double 6 tour leader code as TL_code int Driver is another entity and its attributes are as follows 1 Driver code as D_code int 2 Name as D_name string 3 preferred region as preferred_region string 4 preferred tour length as tourLength double 5 preferred tour type as T_Type string Clerical Assistant performs the following operations 1 Add tour 2 Save tour details 3 Select Driver 4 Save driver information According to the use case scenario a Clerical assistant can select one or more drivers and save their information He may add one or more tour and save tour details Multiple drivers can be assigned to one tour but a driver cannot be assigned to more than one tour at a time Following this way of thinking the Class Diagram was created with the associations that are displayed What is a Communication Diagram
