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(a)(i)The major issue restricting the
commercial use of the World Wide Web is the lack of a trusted, secure
system of paying for products or services. Name three issues that
need to be considered when evaluating a secure payment system.
[3 marks ]
Possible
answers:
• How does the system interact with financial institutions?
• How much does each transaction cost?
• How complex is the system to set up and se?
• Does the system allow anonymous transactions?
• Does the system distribute some cash equivalent?
• What is the relationship between the system, vendor, and user?
• What is the financial risk to the system, vendor, and user?
(Award one mark for each point, up to a maximum of 3 marks.)
(ii)Most payment systems
perform transactions by issuing commands to make
credit card or bank account transactions.Some use an electronic representation
of cash that physically exists on the user ’s machine in electronic
form.State two
advantages and two disadvantages of the electronic representation
method.
[4 marks ]
Advantages:
• transactions can be anonymous (1)
• credit card details do not need to be revealed (1)
Disadvantages:
• money may be spent more than once (1)
• money may be illegally duplicated (1)
(b)Describe four good practices that HTML designers should follow
to ensure that allr users get easy access to the information.In you
answer,you should explain why these each of practices are necessary.[8
marks ]
Designers should:
• be familiar with HTML: unsupported HTML will not work for everyone
• validate pages: incorrect HTML may have unexpected results
• test with other browsers: pages may look different with other
browsers
• produce pages that are not be more than 50K: users don’t
like waiting
• weigh the content for necessity: users don’t want to have
to search through unnecessary information
• identify the audience: different types of people have different
requirements
• provide alternate pages: some browsers won’t support advanced
features
• put text alternatives at the top of the page: users do not
want to have to search for the simpler version
• not rely on font, centering, frames etc. to present information:
different browsers may see things differently
• use pictures sparingly: users don’t want to waste bandwidth
on non-essential graphics
• put pictures on separate pages: users don ’t want to waste
bandwidth on
non-essential graphics
(1) for the point, and (1) for the justification, for up to four of
the above points
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