Software Design First Principles

Question 1

A principle is a?

Answer 1

Fundamental truth or proposition that serves as the foundation for a system of belief or behaviour or for a chain of reasoning.

Question 2

Latin origin of principle?

Answer 2

Principium - beginning, origin, source, foundations

Question 3

Software design principles are the?

Answer 3

Foundation of the software design field and its methodologies, practices and strategies

Question 4

Software Design First Principles?

Answer 4

Suitability
Simplicity
Code Reuse
Modularization
Separation of Concerns
Module Cohesiveness
Module Encapsulation
Abstraction

Question 5

Suitability?

Answer 5

The software design represents a system that satisfies its requirements and serves its purpose

Question 6

Simplicity?

Answer 6

The optimal software design is the simplest design that can be used to build a suitable system

Question 7

Separation of Concerns?

Answer 7

A software system is made of separate modules that communicate with each other through their connections

Question 8

Types of Coupling?

Answer 8

Tight Coupling

Loose Coupling

Question 9

Tight Coupling?

Answer 9

Strong and lasting connections between modules

Question 10

Loose Coupling?

Answer 10

Weaker and temporary connections between modules

Question 11

Types of Cohesiveness?

Answer 11

High Cohesiveness

Low Cohesiveness

Question 12

High Cohesiveness?

Answer 12

Concerns of a module are highly related to each other

Question 13

Low Cohesiveness?

Answer 13

Concerns of a module are very little or not related to each other

Question 14

Objects communicate through two major types of relationships?

Answer 14

Dependencies

Associations

Question 15

Dependency?

Answer 15

Dependencies are temporary relationships that exist only while a method is executing

Question 16

Associations?

Answer 16

Are permanent relationships that exist for the entire life time of an object

Question 17

Encapsulation is also called?

Answer 17

Information hiding

Proposed in 1971 by David Parnas

Question 18

Module Encapsulation Principle?

Answer 18

A software module design shall maximize the information and functionality of the module that is hidden from other modules and minimize its interface

Question 19

Software Reuse Principle?

Answer 19

A software design shall maximize reuse by ensuring n artefact or parts of an artefact are duplicated.

Question 20

Abstraction Principle?

Answer 20

Software design is simplified by defining and maximizing dependencies on abstractions

Question 21

GRASP?

Answer 21

General
Responsibility
Assignment
Software
Patterns or Principles

Question 22

Software Degradation?

Answer 22

Software degradation is the aging effect of software loosing its qualities as it evolves over time

Question 23

Measures of Software Degradation?

Answer 23

Rigidity
Fragility
Immobility
Viscosity
Needless Complexity
Needless Repetition
Opacity

Question 24

Rigidity?

Answer 24

Software is difficult to change

Question 25

Fragility?

Answer 25

Change results in unpredictable behaviour and bugs

Question 26

Immobility?

Answer 26

Reuse and separation of concerns is hard

Question 27

Viscosity?

Answer 27

Original software design is hard to be preserved

Question 28

Needless Complexity?

Answer 28

Design and code that is not used

Question 29

Needless Repetition?

Answer 29

Reuse through copy and paste

Question 30

Opacity?

Answer 30

Software is difficult to understand