[Year 12 SofDev] SD Exam - Question 4

[Don Morelli (Optus)]

Thanks Mark for the time and effort in putting together the UML work
together. You have made it easier for a lot of us.

I agree that the phrasing of the question was bad, as I assume that they did
not mean effective in the way that we would "normally" use it. Maybe they
should have said "the most logical order" to minimize unnecessary steps
being carried out. 

 

However, on thinking over it again we are giving error messages to users and
just getting the message

 

You must enter some data is more effective in conveying the message as to
the actual error, than what I think the reverse of the correct answer would
yield in error messages

 

What you entered is not in the database

You have not entered the correct number of digits

Make sure you only enter numbers and not alphanumerics

You must enter some input

 

So maybe you could argue that the question is OK??? Do any others think that
this is what they meant by effective (in succinctly getting the message
across as to what you had actually done wrong)

Also confused, but I might be confused about that

Don

 

From: sofdev-bounces at edulists.com.au [mailto:sofdev-bounces at edulists.com.au]
On Behalf Of Mark KELLY
Sent: Wednesday, 17 November 2010 1:11 PM
To: Year 12 Software Development Teachers' Mailing List
Subject: [Year 12 SofDev] SD Exam - Question 4

 

Hi all.  I've started getting a bee in my bonnet (or a terrier in my
trousers) about Section C, Q4.

Percy is writing the program specification. For the section dealing with
entry of the Medicare number he writes

If the user makes a mistake entering the Medicare number, the program has to
provide as much information as possible about what is wrong. Therefore
include these validation tests.

Length - to make sure that the correct number of characters has been entered
Existence - to make sure that the number entered exists on Medicare's
database
Null - to make sure something has been entered
Type - to make sure that only numeric characters have been entered

Note: These tests must be performed in the most effective order.


a. Place these validation tests in the most effective order. 1 mark

Then students have to give 3 reasons why it's the most effective way of
doing those tests. (3 marks)


Hmm. What is "effective" about the order? It must relate to how well it does
the job of finding invalid numbers.

But if all 4 tests are going to be conducted, any order of the 4 tests will
yield exactly the same results.

It might be different if we wanted to find invalid numbers soonest, or with
the minimum number of tests, but they are efficiency criteria, not
effectiveness.

I'm seriously starting to believe that this is a Bull Mastiff of a
question... All orders must be equally effective.

I can usually work out what the examiners were probably trying to get at,
but this one has me completely baffled (like multichoice Q3 on the ITA
paper).  
I have no idea whatsoever of what knowledge the examiners are hoping I will
show.

So, can anyone please tell me:

1. how one order can be more effective than another.
2. what order is most effective, and why the reverse order would be less
effective!

Growl.

Mark
-- 
Mark Kelly
Manager Information Systems
Reporting Manager
IT Learning Area Manager

McKinnon Secondary College
McKinnon Rd McKinnon 3204
Victoria, Australia
Direct line / Voicemail: +613 8520 9085
Fax +613 9578 9253
kel at mckinnonsc.vic.edu.au

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