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MT-211 Tutorial - 10

Content

Parsons Chapter 10 Revision Specimen Examination Paper TMAs Review

Courteous of Mr. Vicmon Fan

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Parsons Chapter 10 – Data Representation

Read it yourself to understand: how number of bits affects the amount of

information represented (n bits represent 2n different combinations)

different data representation • number representation• character representation• video representation• sound representation

data compression• technique used to compress data to trim down file

size for storage and transmission• e.g. pkzip for Windows; tar for UNIX

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Revision - Software Development Life Cycle (SDLC)

The SDLC usually consists of the following activities: User Requirements (Chapter 32, partly) System Analysis (OOA: Chapters 33-37) System Design (OOD: Chapters 43, 45, 46) Implementation (MT210) Maintenance (MT210, partly)

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Revision - Requirement Analysis

Goal: A negotiated and unambiguous statement of requirements. All subsequent design is based on this Negotiated

Statement of Requirements

Technique: Q & A sessions (from broad to narrow scope)

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Revision - OOA and OOD

Uses CARC technique

Identify:

• Classes (OOA)

• Associations (OOA)

• Responsibilities (OOD)

• Collaborations (OOD)

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Revision - OOA (1)

Identifying Classes Textual/Noun Analysis

• Noun or Noun Phrases – Classes

• Verb or Verb Phrases (or propositions) – Associations

Identifying is-a-kind-of Relationship Representing as superclass (abstract or concrete)

and subclass relationship

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Revision - OOA (2)

Identifying Associations Class-Association Matrix

Verb Analysis

Verb or Verb Phrases (or propositions)

Name the Association

Determine the Multiplicity One-to-one

One-to-many

Many-to-many

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Revision - OOA (3)

Class-Association Diagram Notation All names start with capital letter – use hyphen or

capital-first-letter to separate a multiple-word name. Must be descriptive.

Class - a rounded rectangle with a name inside

Association

Must have a name

Line and solid dot for 1 and many multiplicity respectively

Arrow for navigation direction

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Revision - The Object Model (1)

Class-Association Diagram Orchestrating instance Classes

• is-a-kind-of relationship Associations

• multiplicity

• navigation directory (if can be determined)

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Revision - The Object Model (2)

Textual Representation of the ClassOrchestrating instanceClass description and responsibilities

• specify is-a-kind-of relationship, if any Invariants

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Revision - OOD – Responsibilities

Recording information (I) implemented by instance variables

Performing actions (A) implemented by instance methods Only method heading is required

Keeping track of related objects (R) for representing associations between classes often a Collection is used to keep track of more

than 1 instance of the other class Performing actions described by walk-throughs (O)

implemented by instance methods of orchestrating instance

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Revision - OOD - Collaborations

One-to-One Use an instance variable

• hold reference of the object in the direction of navigation

One-to-Many Use an instance variable

• hold reference of the (collection) object with respect to the many side of the navigation

Many-to-Many Use an instance variable (holding a collection)

• hold reference of the (collection) object in the direction of navigation

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Revision - HCI – Its Importance

safety

commercial success of software enabling techniques that would be impractical

without software lowers training costs extraordinary HCI (special interface to help users with

disability)

productivity and efficiency quality of life of users

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Revision - User Interface Design Approach

Style Guides collection of design principles and rules for

developing consistent user interface User-centred Design

Use of design principles and data collection techniques:• Think User, Think Task, Think Situation)

Teleocentric (Usage-centric) Design Emphasize the purpose of the software being

designed Developer creates software tools which enable

users to achieve their goals easily and quickly Techniques: use-case and essential use-case

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Revision - Direct Manipulation

Continuous representation of the objects of interest Replacement of complex commands by direct

manipulation of the object through intuitive means such as labelled button presses

Rapid, reversible, incremental actions

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Last but not Least

Prepare for the Examination Specimen Exam Paper ( download from OLE ) TMA & reviews Revision Notes ( download from Vicmon’s site ) Exam Guide ( download from Vicmon’s site )

Wish you all Good Luck in the Exam!

Thank you very much!