TAILIEUCHUNG - Lecture Software engineering: Lecture 10 - Ivan Marsic

Lecture 10: Specifying systems - intro. The main contents of this chapter include all of the following: Domains, phenomena; states, events; context diagrams; systems and system descriptions; basic formalisms for specifications. | Ivan Marsic Rutgers University LECTURE 10: Specifying Systems - Intro Topics Domains, Phenomena States, Events Context Diagrams Systems and System Descriptions Basic Formalisms for Specifications Boolean Logic Finite State Machines World, Parts, Phenomena Example of a Problem Domains Example of Problem Domains Example of Problem Domains Software-to-be (1) Tenant (4) List of valid keys (3) Lock (6) Photosensor (7) Light (8) Alarm bell (9) Desktop computer (2) Landlord (3) Key (5) Device preferences (10) Tenant accounts (11) Log of accesses Definitions A phenomenon is a fact, or object, or occurrence that appears or is perceived to exist An event is an individual happening, occurring at a particular point in time Events are indivisible and instantaneous A state is a relation among individual entities and values, which can change over time Individuals are in relation if they share a certain characteristic RelationName(Individual1, , .

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