WDD - Theory Flashcards
Evaluate a website solution in terms of fitness for purpose
A website is fit for purpose if it meets the end-user requirements and the functional requirements set out at the analysis stage.
What should you check/look for when testing a website
- 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
What type of code is used to provide interactivity on a website?
Javascript
What are the 2 javascript events you need to know for national 5
onmouseover
onmouseout
When a user moves the cursor over a title, a popup message appears. What has caused this to happen?
A javascript(code) onmouseover event.
When a user moves the cursor off an image, it changes to a diffrent image. What has caused this to happen?
A javascript(code) onmouseoff event
Describe an end user requirement?
The end user requirements of a website are the tasks that the user would want to be able to carry out on the site.
Describe a functional requirement?
The functional requirements of a website are the processes that the website has to perform inorder to met the end user requirements
How should you begin an end-user requirement?
Users (or other appropriate terms) what to/would like to ….
How should you begin a functional requirement?
The website should have ….
Which law stops websites using other peoples content without permisson?
Copyright, Designs and Patents Act (1988)
What do you need to consider under the Copyright, Designs and Patents Act when using other people’s content?
You must get permission to use content created by other people and abide by an conditions given
What do you need to consider under the Copyright, Designs and Patents Act when using your own content?
As you have created the content you do not need permission under the sct to use it.
Describe the need for compression
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.
Name the 2 types of compression?
Lossy and Lossless
Describe lossless compression?
- none of the original data is lost
- file tends to be larger compared to lossy compression
Describe lossy compression?
- 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
Explain how Low-fidelity prototypes are used?
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.
Which graphic file type(s) supports animation?
Gif
Which graphic file type(s) can be used to store photo/photo realistic images?
PNG and JPEG
Which graphic file type(s) support transparency?
GIF and PNG
Which graphic file type would you use to store a simple image
GIF
What type of compression is used by the 3 graphic file types
Lossy: JPEG
Lossless: GIF,PNG
Which graphic file types support animation
Animation: GIF
No Animation: JPEG,PNG
Which graphic file types support
transparency?
Transparency: GIF,PNG
No Transparency: JPEG
What is Colour Depth used by the 3 graphic file types?
24 bit colour depth (16,777,216 colours): JPEG, PNG
8 bit colour depth (256 colours): GIF
What is the recommended use of the 3 graphic file types
GIF: Not suitable for photographs, good for cartoons and animations
PNG, JPEG: Used to store photographs
Describe the key features of the Audio file type?
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
Describe the resolution and how it can affect file size and quality
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
Describe the colour depth and how it can affect file size and quality
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
Describe sample rate and how it can affect file size and quality
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
