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Survey reusability through Object Orient Design

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MR and IT: separated at birth? Presentation of OOD concepts ... Same father: Blaise Pascal (1623-1692) Inventor of the first mechanical adding machine (1642) ... – PowerPoint PPT presentation

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Title: Survey reusability through Object Orient Design


1
Survey reusability through Object Orient Design
Survey reusability through Object Oriented Design
Sunday, 22 November 2009
2
Agenda
  • MR and IT separated at birth?
  • Presentation of OOD concepts
  • Example of an OOD survey system BMRBs PTK
  • OOD a future for Market Research?

3
Introduction

Statistics and IT close relatives?
  • Same father Blaise Pascal (1623-1692)
  • Inventor of the first mechanical adding machine
    (1642)
  • Formulated the mathematical theory of probability
    (1654)
  • They have unachievable goals
  • Bug free software
  • Reliable and actionable information
  • Dusty image slowly improving

4
Introduction

Evolution
  • Machine code and assembly
  • Structured languages (1971)
  • GUI languages (1991)
  • Object oriented environment (2001)
  • Card column punch
  • Quantime, Bellview(mid 70s)
  • In2itive, Askia (mid 90s)

5
The concepts design
  • The design stage is not an option, its a must
  • Design is about managing complexity a design
    method helps you to split big projects into
    manageable chunks that you will be able to
    comprehend separately
  • In object-oriented design, complexity is managed
    using abstraction
  • Abstraction is the elimination of the
    irrelevant and the amplification of the
    essential Robert Martin

6
Object Oriented Design
  • OOD is an attempt at unifying the world into
    hierarchical concepts
  • Cars, cycles and trains are vehicles
  • Motorcycles and bicycles are cycles
  • My Peugeot is an implementation of the vehicle
    class
  • An object is sometimes the class or the
    implementation
  • A vehicle is a virtual class

7
Object Oriented Design
  • Objects have
  • Behaviours (they do things) referred as methods
  • Properties or states (they have things) referred
    as attributes

8
Methods
  • Vehicles have a Start and a Stop method. A
    uniform way to start and to stop among all
    implementations
  • Some sub-classes of vehicles may have methods
    specific to them

9
Attributes
  • Vehicles usually have a maximum speed
  • Land vehicles have a number of wheels

10
3 founding paradigms
  • Encapsulation
  • Inheritance
  • Polymorphism

11
Paradigm 1 encapsulation
  • An object is a black-box. You do not need to see
    whats inside to use it
  • Encapsulation also means that an object includes
    everything it needs both the data and the
    operations on it (methods)
  • The encapsulation concept is very powerful
    because it allows an efficient division of labour
    in large projects

12
Paradigm 2 inheritance
  • Reusability is another flagship of OOD
  • The complex job is done once and for all in a
    parent class. And it is tested once!
  • Deriving and Overriding

13
Paradigm 3 polymorphism
  • Generally, the ability to appear in many forms
  • Here the ability to process objects differently
    depending on their class

14
Survey reusability through Object Orient Design
A real life example
BMRB, the TGI and the PTK
15
Background
  • Very large survey (23 000 responses, 30 000
    interviews)
  • Questionnaire scanned (hence data needs to be
    cleaned)
  • Large printed volumes produced
  • Need a custom tool

16
Background (prior to 1998)
  • The edit script used CCP (PTTs Star software
    sta spec)
  • 10 000 lines of script
  • The reporting used PTTs Startab- stb spec
  • The weighting used QSL
  • Pressure was on to deliver a multi language /
    multi country system able to deliver on a
    quarterly base

17
The TGI questionnaire
  • Very repetitive subjects (baked beans, sausage
    rolls, soap,)
  • Edited in the same manner
  • Reported in the same manner

A case for OOD
18
Templates

19
Subjects
  • Easy to define
  • Easy to maintain
  • Concurrent access

20
Subjects

21
The edit language
  • CCP free
  • Brand / response independent
  • Overridable

22
Testing the edits

23
The reports

24
The report language

25
Conclusion
  • PTK is still ahead of its time
  • But reusability was its raison detre
  • What about commercial packages?

26
Object Oriented Survey?
  • Improve the library concept
  • AskML interoperability made possible
  • Conjoint analysis on all packages?
  • Metaquestions in Dimensions

27
Thanks
  • Steve Harris
  • Kevin Wavell
  • Mark Pietronave
  • Steve Taylor

28
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