Lesson 5 - Intro to design concepts (Ch 12)

Question 1

A software design creates meaningful engineering representation (or _____) of some software product that is to be built.

Answer 1

model

Question 2

Designers must strive to acquire a repertoire of alternative design information and learn to choose the elements that best _____ the analysis model.

Answer 2

match

Question 3

A design model can be traced to the customer’s requirements and can be assessed for quality against _____ criteria.

Answer 3

predefined

Question 4

During the design process the software requirements model (data, function, behavior) is _____ into design models that describe the details of the data structures, system architecture, interfaces, and components necessary to implement the system.

Answer 4

transformed

Question 5

Each design product is reviewed for _____ (i.e. identify and correct errors, inconsistencies, or omissions, whether better alternatives exist, and whether the design model can be implemented within the project constraints) before moving to the next phase of software development.

Answer 5

quality

Question 6

• Encompasses the set of principles, concepts, and practices that lead to the development of a high quality system or product
• Design principles establish and overriding philosophy that guides the designer as the work is performed
• Design concepts must be understood before the mechanics of design practice are applied
• Goal of design engineering is to produce a model or representation that is bug free (firmness), suitable for its intended uses (commodity), and pleasurable to use (delight)
• Software design practices change continuously as new methods, better analysis, and broader understanding evolve

Answer 6

Software Design

Question 7

Design Concepts

allows designers to focus on solving a problem without being concerned about irrelevant lower level details (procedural abstraction - named sequence of events and data abstraction – named collection of data objects)

Answer 7

Abstraction

Question 8

Design Concepts

overall structure of the software components and the ways in which that structure provides conceptual integrity for a system. Structural models, framework models, dynamic models, process models, functional models

Answer 8

software architecture

Question 9

software architecture

architecture as organized collection of components

Answer 9

Structural models

Question 10

software architecture

attempt to identify repeatable architectural patterns

Answer 10

Framework models

Question 11

software architecture

indicate how program structure changes as a function of external events

Answer 11

Dynamic models

Question 12

software architecture

focus on the design of the business or technical process that system must accommodate

Answer 12

Process models

Question 13

software architecture

used to represent system functional hierarchy

Answer 13

Functional models

Question 14

Design Concepts

description of a design structure that solves a particular design problem within a specific context and its impact when applied

Answer 14

Design Patterns

Question 15

Design Concepts

any complex problem is solvable by subdividing it into pieces that can be solved independently

Answer 15

Separation of concerns

Question 16

design concepts

the degree to which software can be understood by examining its components independently of one another

Answer 16

Modularity

Question 17

design concepts

information (data and procedure) contained within a module is inaccessible to modules that have no need for such information

Answer 17

Information Hiding

Question 18

design concepts

achieved by developing modules with single-minded purpose and an aversion to excessive interaction with other models

Answer 18

Functional Independence

Question 19

Functional Independence

qualitative indication of the degree to which a module focuses on just one thing

Answer 19

Cohesion

Question 20

functional independence

qualitative indication of the degree to which a module is connected to other modules and to the outside world

Answer 20

Coupling

Question 21

design concepts

process of elaboration where the designer provides successively more detail for each design component

Answer 21

Refinement

Question 22

design concepts

a representation of a cross-cutting concern that must be accommodated as refinement and modularization occur

Answer 22

Aspects

Question 23

design concepts

process of changing a software system in such a way internal structure is improved without altering the external behavior or code design

Answer 23

Refactoring

Question 24

• Complete (includes all necessary attributes and methods) and sufficient (contains only those methods needed to achieve class intent)
• Primitiveness – each class method focuses on providing one service
• High cohesion – small, focused, single-minded classes
• Low coupling – class collaboration kept to minimum

Answer 24

Design Class Characteristics