Chapter 7

Question 1

What are the 4 stages of software development lifecycle

Answer 1

1) Analysis
2) Design
3) Coding
4) testing

Question 2

Analysis

Answer 2

Part of the program development life cycle
Uses abstraction and decompositions tools to identify exactly what is required from the program

Question 3

Abstraction

Answer 3

Keeps the key elements required for the solution to the problem and discards any unnecessary details and information that is not required.

Question 4

Decomposition

Answer 4

breaks down a complex problem into smaller parts which can then be divided into into even smaller parts that can be solved easily.

Question 5

Design

Answer 5

The program specification from the analysis stage is used to show how the program should be developed.
Structure diagrams , flowcharts, pseudo code

Question 6

Coding

Answer 6

The program is developed/ written.
Iterative testing test are repeated until the module performs as required.

Question 7

Testing

Answer 7

Testing program code using test data to make sure it meets the requirements.

Question 8

What is a computer system made up of

Answer 8

Software , data , hardware , communications and people

Question 9

Computer sub systems

Answer 9

Each computer system can be divided up into a set of sub systems. Each sub system can be further divided inti sub systems and so in until each sub system just performs a single action

Question 10

Computer systems sizes

Answer 10

Can be very large , very small or any size in between

Question 11

Computer systems sizes

Answer 11

Can be very large , very small or any size in between

Question 12

Top down design

Answer 12

The decomposition of a computer system into a set of sub systems then breaking each sub system down into smaller sub systems until each sub system just performs a single action.

Question 13

Decomposition

Answer 13

Breaking a complex problem down into smaller more manage parts

Question 14

Advantages of problem decomposition

Answer 14

Makes problems easier to solve
Different people can work on different parts of a problem at the same time, reducing development time.
Program components developed in one program can easily be used in other programs

Question 15

Inputs

Answer 15

The data used by the system that needs to be entered while the system is active

Question 16

Processes

Answer 16

The tasks that need to be performed using the input data and any other previously stored data

Question 17

Outputs

Answer 17

Information that needs to be displayed or printed for the users of the system

Question 18

Storage

Answer 18

Data that needs to be stored in files on an appropriate medium for use in the future

Question 19

Structure diagrams

Answer 19

A hierarchical way of showing how a computer system solution can be divided into sub systems with each level giving a more detailed breakdown.

Question 20

Flowcharts

Answer 20

An Show the steps required to complete a task and the order that they are performed.

Question 21

Terminator flow charts

Answer 21

Are used at the beginning and end of each flowcharts.
Start stop
Rectangle with curved edges

Question 22

Structure diagrams

Answer 22

A method of designing a solution to a problem
Produced using a methid known as step wise refinement
Break a problem down into smaller sub problems using decomposition
Some areas of the program will need to be broken down more than others
Lowest level nodes should achieve ine task and therefore be coded as a single module or sub program

Question 23

Pseudo code

Answer 23

Is an alternative text based way of representing the sequence of steps in an algorithm
Simplified form of programming code
Without worrying about the actual rules and syntax of a particular language

Question 24

Process

Answer 24

Square
Where something is happening like a calculation

Question 25

Decision

Answer 25

Diamond
Ask a question

Question 26

Input and output

Answer 26

To display input or output parallelogram

Question 27

Subroutine

Answer 27

Rectangle with 2 lines

Question 28

Pseudo code
+
-
*
/

( )
<-

Answer 28

Add
Subtract
Multiply
Divide
Raise to the power
Group
Has the value