**Instructions given to students as they prepare for a comprehension
test in modelling**

### from S. K. Houston

__Comprehension test.__

This article is called ....... It is written by .....

The examiners have added consecutive line numbers in the margin, with,
usually, every tenth line being numbered. This is to facilitate references
to the text by both examiners and candidates.

Note that there are some mistakes and misprints in the article.

In their preparation candidates should use a spread sheet or some other
tool to investigate thoroughly the procedure described in lines ......, and
should attempt to verify the results presented subsequently in the article.

Also candidates should bear in mind the following questions which relate
to the modelling process:

- What modelling assumptions have the authors made?
- Have they stated these explicitly or are they implied by something
the authors have written?
- Are they
*reasonable* assumptions? Would you be happy to make
these assumptions or would you make others?
- Do the authors justify the assumptions? If not can you give a justification
of them?
- Can you follow the mathematics through from line to line? Have the
authors made any mistakes?
- Are the numerical calculations right?
- Can you explain all statements like "it can be shown that ...."
or "it follows that ..." or "clearly...."?
- Have the authors attempted to validate the model by comparing with
observations? If not can you suggest experiments that could be carried
out?
- Do the authors draw valid inferences and conclusions from the work?
- Is sufficient background information to the problem given in the article
or is it necessary to find out things from other sources?

You should be able to relate the article to a Modelling Flowchart.

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