WDD - Theory

Question 1

Evaluate a website solution in terms of fitness for purpose

Answer 1

A website is fit for purpose if it meets the end-user requirements and the functional requirements set out at the analysis stage.

Question 2

What should you check/look for when testing a website

Answer 2

• checking that the web pages match the user-interface design
• ensuring that all links and navigation work correctly
• ensuring that all text, graphics and video display correctly
• checking that pages are consistent

Question 3

What type of code is used to provide interactivity on a website?

Answer 3

Javascript

Question 4

What are the 2 javascript events you need to know for national 5

Answer 4

onmouseover
onmouseout

Question 5

When a user moves the cursor over a title, a popup message appears. What has caused this to happen?

Answer 5

A javascript(code) onmouseover event.

Question 6

When a user moves the cursor off an image, it changes to a diffrent image. What has caused this to happen?

Answer 6

A javascript(code) onmouseoff event

Question 7

Describe an end user requirement?

Answer 7

The end user requirements of a website are the tasks that the user would want to be able to carry out on the site.

Question 8

Describe a functional requirement?

Answer 8

The functional requirements of a website are the processes that the website has to perform inorder to met the end user requirements

Question 9

How should you begin an end-user requirement?

Answer 9

Users (or other appropriate terms) what to/would like to ….

Question 10

How should you begin a functional requirement?

Answer 10

The website should have ….

Question 11

Which law stops websites using other peoples content without permisson?

Answer 11

Copyright, Designs and Patents Act (1988)

Question 12

What do you need to consider under the Copyright, Designs and Patents Act when using other people’s content?

Answer 12

You must get permission to use content created by other people and abide by an conditions given

Question 13

What do you need to consider under the Copyright, Designs and Patents Act when using your own content?

Answer 13

As you have created the content you do not need permission under the sct to use it.

Question 14

Describe the need for compression

Answer 14

Compression is to reduce the size of a file with limited impact on image quality.

A compressed file:
The smaller file downloads / streams more quickly, which gives users a better experience and uses less of their data.

Question 15

Name the 2 types of compression?

Answer 15

Lossy and Lossless

Question 16

Describe lossless compression?

Answer 16

• none of the original data is lost
• file tends to be larger compared to lossy compression

Question 17

Describe lossy compression?

Answer 17

• some of the original data is lost although compression algorithms attempt to minimise the loss of quality
• file tends to be smaller compared to lossless compression

Question 18

Explain how Low-fidelity prototypes are used?

Answer 18

Low-fidelity prototype designs are created on paper to give the end user an idea of the look and
feel of the website.

The user may provide feedback at this early stage allowing unsatisfactory designs to be altered before time is wasted implementing pages, this reduces the cost to the company.

When using rough sketches or very simple models, users may feel more comfortable suggesting changes.

They can also show users how they would navigate through a website.

Question 20

Which graphic file type(s) supports animation?

Answer 20

Gif

Question 21

Which graphic file type(s) can be used to store photo/photo realistic images?

Answer 21

PNG and JPEG

Question 22

Which graphic file type(s) support transparency?

Answer 22

GIF and PNG

Question 23

Which graphic file type would you use to store a simple image

Answer 23

GIF

Question 24

What type of compression is used by the 3 graphic file types

Answer 24

Lossy: JPEG
Lossless: GIF,PNG

Question 25

Which graphic file types support animation

Answer 25

Animation: GIF
No Animation: JPEG,PNG

Question 26

Which graphic file types support
transparency?

Answer 26

Transparency: GIF,PNG
No Transparency: JPEG

Question 27

What is Colour Depth used by the 3 graphic file types?

Answer 27

24 bit colour depth (16,777,216 colours): JPEG, PNG
8 bit colour depth (256 colours): GIF

Question 28

What is the recommended use of the 3 graphic file types

Answer 28

GIF: Not suitable for photographs, good for cartoons and animations
PNG, JPEG: Used to store photographs

Question 29

Describe the key features of the Audio file type?

Answer 29

WAV

• Uncompressed
• High quality sound
• Standard for audio CDs
• Large file sizes make WAV less suitable for streaming, and requires more storage space

MP3

• Lossy compression (Removes high and low frequencies generally not heard by human ear)
• Small file sizes make MP3 more suitable for streaming, and requires less storage space

Question 30

Describe the resolution and how it can affect file size and quality

Answer 30

The resolution of an image is the total number of pixels in the image.

Higher resolution:
better image quality/larger file size

Lower resolution:
lower image quality/ smaller file size

Question 31

Describe the colour depth and how it can affect file size and quality

Answer 31

The colour depth is the number of bits used to store the colour for each pixel in an image.

The higher the colour depth
the greater the number of colours meaning a better image quality
the larger the file size

The lower the colour depth:
the smaller the number of colours meaning a lower the image quality
the smaller the file size

Question 32

Describe sample rate and how it can affect file size and quality

Answer 32

The sample rate is a measure of how many times per second a sound is sampled.

higher sample rate:
better audio sample quality/larger file size
** lower the sample rate:**
lower audio sample quality/smaller file size