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CASE Tools And Their Effect On Software Quality. Peter Geddis – pxg07u. COMPUTER ASSISTED SOFTWARE ENGINEERING. What is CASE? CASE is a term covering a whole range of tools and methods that SUPPORT SOFTWARE SYSTEM DEVELOPMENT CASE Tools and Methods

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computer assisted software engineering

What is CASE?

  • CASE is a term covering a whole range of tools and methods that SUPPORT SOFTWARE SYSTEM DEVELOPMENT

CASE Tools and Methods

  • These tools and methods reduce the load on developers allowing them to focus their skills on other goals
  • Usable at all stages of the Software Development Life Cycle
  • Example -
    • Automating tasks such as code generation and model transformations would take a lot of time for a human developer!
more what is case
MORE ‘What Is CASE???’
  • CASE provides automation and aided design to developers in almost every single developer program for the last couple decades
  • CASE Tool and Method Categories -
    • Data Modelling
    • Model andProgram Transformation
    • Refactoring tools
    • Source code generation
    • Unified Modelling Language
    • Documentation
data modeling
Data Modeling

What is Data Modeling?

  • A method that defines data requirements as data models representing the business processes of the system
  • These Data Models contain data elements, structure and relationships of a system as well as providing the definition and format for those parts
  • Models should be considered progressive ‘living’ documents that change with requirements
  • Basically the foundations that make the system work!
data modeling process
Data Modeling Process
  • Conceptual Data Model
    • Describes the semantics of an organizations entities and represents significant attribute and relationship concepts within the organization
  • Logical Data Model
    • Actual implementation of a conceptual data model using a particular data management technology - This may require multiple logical data models to complete
  • Physical Data Model
    • Giving the logical data model real-world implementation values
model and program transformation
Model and program transformation

What Is Model and Program Transformation?

  • Simple Description
    • Its takes A and produces B using models to perform the transformation
  • Real Description
    • Object A conforms to a given meta-model A and produces as output Object B conforming to given meta-model B
  • Model-Driven Engineering uses the concept of Model Transformation to allow domain-less concepts
  • Example -
    • Convert a Text doc to a Word doc – (Abstract example!)
model and program transformation7
Model and Program Transformation
  • Used in areas such as Compiler Construction and Documentation Generation
  • Benefits software development through increased productivity by –
    • Maximizing compatibility between systems
    • Simplifying the process of design
    • Promoting communication between the people working on the system
  • Program Transformation is useful for generating new programs modified for example to contain comments or transformed based on a pattern

What Is It?

  • Description
    • The process of modifying a systems internal structure without changing its external behavior and functionality
    • Can be thought of as a special type of Program Transformation
  • Example -
  • Refactoring is generally used when there’s a desire to modify code to –
    • Fit a particular coding style
    • Improve aspects of the code such as
      • Readability
      • Performance
      • Coding Structure
  • Useful for machines to do the work of refactoring software
    • Comp – ‘1 Second’ to change all class instances in a system
    • Human – ‘1 Hour’ to change hopefully all instances
source code generation
Source code generation

What is It……..Oh wait, That’s easy!

  • Simple Description
    • Source Code Generation is the automatic generation of code
  • Better Description
    • Method for generating code based on an ontological model of the source language containing language concepts and their relationships
    • Ontological Model = Representation of the source language
  • Example -
    • Model allows an IDE to automatically fill class names for you
source code generation11
Source code generation
  • This CASE tool is used in range of highly useful ways including –
    • Programs that create Graphical interfaces in a drag and drop manner, background code generation at work
    • Infer the direction your code is going
      • Auto suggestions
    • Add extra code to the system without needing human approval
      • Doing the setup and run work for you
source code generation12
Source code generation

How it improves Software Quality

  • Human Error does not mix well with coding
  • Developer benefited by automatic suggestions of variables, classes, components, etc meaning less risk of errors
  • Generated code can be almost always guaranteed as correctly written
unified modeling language
Unified Modeling Language
  • What is It?
    • Standardized general-purpose visualizing modeling language
    • Combine multiple methods of modeling and diagrams to form a comprehensive whole
  • What is it used for?
    • Used to construct and document objects and object-oriented systems
    • Equivalent to a blueprint for a building but with the blueprint representing software
unified modeling language14
Unified Modeling Language

UML Modeling Categories

  • Structural
    • Takes static aspects of the system such as objects, attributes, methods and the relationships between to form a structure representing the system
  • Behaviour
    • The systems dynamic behavior (as if the system was running) is captured using dynamic diagrams including activity, sequence, communication and state machines
unified modeling language15
Unified Modeling Language
  • UML is widely used at all cycles of the software life cycle due to its usefulness bringing a system together
  • UML Programs
    • Allow creation and modification of modeling diagrams much more efficiently then modeling on paper
    • Depth can be added to sections
      • Links to other work
    • Electronic UML can be stored in a central repository allowing all team members to access up-to-date documentation and system design
    • Transfer of whole or sectional designs possible
  • What is It?
    • Documentation tools allow the creation, modification, and updating of system documentation
    • Compared to other CASE tools these are considerably more basic, however this shouldn’t be taken as useless!
  • Documentation tools can be used to –
    • Generate standard forms
    • Auto correct spelling mistakes
    • Improve layout
    • Generate documentation automatically
  • Why it benefits Software Quality?
    • Documentation details the system and its development, if there’s a problem good documentation is invaluable for finding recent modifications or solving the error
    • Use of tools results in a more polished document, one that is a higher-quality
    • It can create documentation from code (such as Class Definitions) that accurately depicts the codes functions with a depth of detail a human developer couldn’t achieve without more time
case summary
CASE Summary
  • Letting a machine do work produces correct output as long as the model the machine is using is correct
  • Automating tasks frees more time up that can be spent improving the software in other ways
  • UML and data modeling is a great way to construct a system from scratch and spot major quality-flaws early on
    • So general purpose it could solve or aid in any system design
case summary19
CASE Summary
  • Overall use of CASE tools on a software system improves software quality dramatically by –
    • Reducing errors
    • Improving designs throughout the development
    • Standardizing many tasks and development aspects
    • Providing many many well-tested automated functions
    • Centralizing resources
  • CASE is so good for software development its extremely rare to find a program that doesn’t include some form of it within the last 2 decades
case downside
CASE Downside
  • CASE has little effect on a few aspects of development and software quality.
  • This is because those aspects are hard or just impossible to automate
  • Example –
    • Requirements Gathering and Definition
    • Requires human input!
the end
The End


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