The purpose of the evaluation system is to show you which answers are correct and which are incorrect. Once all the available attempts have been exhausted, correct answers are substituted for any incorrect answers remaining.

What happens in an evaluation?

The results of the evaluation are displayed using a simple, intuitively comprehensible colour-scheme that is consistently applied throughout the entire module:

Correct answer (first time):	…because of its turbulent air motions…
Incorrect answer:	…because of its stability throughout the year…
Correct answer (after further attempt):	…because of its turbulent air motions…
Corrected answer:	…because of its turbulent air motions…

These colors are also used to identify the fields in the control panel that display the quantities of answers that fall into each type respectively.

General form of evaluation

If further attempts are still possible after performing an evaluation, any mouse or key action will clear the evaluation results and ready any incorrect gaps in the exercise for further input.

The incorrect content of the gap will usually be left in place, although in certain exercises it may be cleared and return to a neutral state.

Gaps containing correct answers — whether at the first attempt or at a subequent attempt — are locked. They cannot be revisited until the exercise has been completed and then restarted.

As noted elsewhere, it is an important part of the learning process that on completion of a page you should not be left looking at (and possibly memorizing) incorrect answers. Answers which have been corrected in this way are colour-coded as such, but at the completion of the page the questions are all completed correctly.

Evaluation on demand and immediate evaluation

Most exercises are usually evaluated on demand. This means that the evaluation applies to all the gaps on the exercise page and is initiated whenever you want.

Exercises can also be evaluated on a gap by gap basis.

• This evaluation can be launched by clicking on the evaluate button or using the evaluation shortkut key.
• It can usually also be triggered by clicking on a different gap or even outside any of the gaps in the exercise.
• The evaluation is only performed on the currently active gap.
• The number of attempts allowed in the exercise relates to each gap and not to the exercise as a whole. In an exercise that is evaluated on demand, for example, if three attempts are specified then you will only have three attempts to get all the gaps on the exercise page correct before the exercise is completed. If, on the other hand, the exercise is evaluated gap by gap and there are, say, ten gaps on the exercise page, then you will have in effect 3 x 10 = 30 attempts on that page as a whole.

Free sequence and forced sequence exercises

It may be necessary in certain exercises — for example, where the answer for one gap is dependent upon the answer in a preceding gap — to evaluate each gap as it is completed.

The procedure is similar to that described above for gap by gap evaluation, with the exception that you can only select gaps in the order that they appear on the page. After completing a gap you will be moved automatically on to the next gap in the sequence.