Consider the following questions when writing your report:
Assess significance
Is the topic addressed important/interesting? (Does the review say why?)
How original is the review?
(compared with existing reviews of field?)
Are the results reported significant?
Verify accuracy
Are all claims backed by evidence?
Are the evidences relevant/reliable/sufficient?
Are methods/results appropriate and
well-described?
Is important relevant work omitted?
Does the review suffer from any bias?
Improve clarity
Is the review well organized?
Do title/abstract accurately reflect content?
Right level of detail?
Language issues or typos?
The typical report consists of one page of plain text. To help the author and editor, all claims should be backed by evidence.
A note on the format of your peer-review: the best format to submit your review is just plain text pasted in the relevant fields. Alternatively, you can submit a PDF or DOC document, but be aware that your name might be included in the metadata of that document, thereby compromising your anonymity.