1. Principles of Engineering System Design Dr T Asokan asok@iitm.ac.in

2. Principles of Engineering System Design Dr T Asokan asok@iitm.ac.in GRAPHICAL MODELLING TECHNIQUES

3. MODELLING TCHNIQUES Data Model : Relationships between data entities. Ex: ER Diagrams, Higraph Process Model :Modelling of processes: what, when.. Ex: Data flow, N2. Behavior Model:Control, activation, termination of system functions Ex: FFBD, Behavior diagrams, Petrinets

4. DATA Modelling Entity Relationship Diagrams –Models the data structures or relationships between data entities ( An entity is a class of real, similar items like people, computer, books etc.) –Creating ERD Identify the entities Determine significant events Analyse nature of interactions Draw ERD –Complex ER Diagrams

5. Higraphs Higraphs are generalisation of complex ER diagrams. An entity is considered to be a set with multiple elements, called a blob