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Software Design Patterns– What & Why Example Pattern:Publisher-Subscriber (a.k.a. Observer) (besides development) Understand (existing software) Maintain (fix bugs) Upgrade (add new features)

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Structural Cohesion Metrics Internal Cohesion or Syntactic Cohesion External Cohesion or Semantic Cohesion

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Software complexity is difficult to operationalize complexity so that it can be measured Computational complexity measure big O (or big Oh), O(n) Measures software complexity from the machine’s viewpoint in terms of how the size of the input data affects an algorithm’s usage of computational resources (usually running time or memory) Complexity ...

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Why Measure Software Fundamentals of Measurement Theory Use Case Points

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REQ-1: Map input data to output data as said by given rules REQ-2: Allow repository (or document) editing, where “repository” is a collection of data REQ-3: Automatically control a physical object/device REQ-4: Interactively control a physical object/device REQ-5: Monitor and display information about an object

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Typical System Requirements and Problems Five Problem Frames: Transformation Simple Workpieces Required Behavior Information Display Commanded Behavior

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UML State Machine Diagrams State Activities: Entry, Do, and Exit Activities Composite States and Nested States Concurrency UML Object Constraint Language (OCL) OCL Syntax OCL Constraints and Contracts

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Domains, Phenomena States, Events Context Diagrams Systems and System Descriptions Basic Formalisms for Specifications Boolean Logic Finite State Machines

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Overview of Software Testing Test Coverage and Code Coverage Practical Aspects of Unit Testing Integration and System Testing

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Assigning Responsibilities to Objects Design Principles Expert Doer High Cohesion Low Coupling Business Policies Class Diagram

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