Ive recently been asked to review for a letter format journal (articles less than 4 pages) for rapid publication. The same standard criteria of original content, novelty and relevant references as for other journal publications are required. Looking to the referee guide of the journal, it is stated that

When reviewing, reviewers should ask themselves 'Is this paper suitable for rapid publication?'

I am unable to find any discussion or guideline that clearly state what merits acceptance for rapid publication compared to the normal peer-review process for journal article submissions. Publishing as a IEEE letter vs article gives some input from the guidelines of IEEE JMEMS, where the author should argue why it is eligible for rapid publishing, although, Im not sure if this guideline is general for all journals.

I can understand that rapid publishing has benefits for authors and can be required by publishers due to competition. But I dont see what I, as a reviewer, is supposed to look for.

Since the letter format is short, not all aspects can be covered in the submission. Since the decision is binary (accept/reject), questions related to the submission cannot be answered or clarified by the authors through the review process. The situation arises that the submission can be original and novel, but may lack investigations or results. Should I still accept?

Ive recently been asked to review for a letter format journal (articles less than 4 pages) for rapid publication. The same standard criteria of original content, novelty and relevant references as for other journal publications are required. Looking to the referee guide of the journal, it is stated that

When reviewing, reviewers should ask themselves 'Is this paper suitable for rapid publication?'

I am unable to find any discussion or guideline that clearly state what merits acceptance for rapid publication compared to the normal peer-review process for journal article submissions. Publishing as a IEEE letter vs article gives some input from the guidelines of IEEE JMEMS, where the author should argue why it is eligible for rapid publishing, although, Im not sure if this guideline is general for all journals.

I can understand that rapid publishing has benefits for authors and can be required by publishers due to competition. But I dont see what I, as a reviewer, am supposed to look for.

Since the letter format is short, not all aspects can be covered in the submission. Since the decision is binary (accept/reject), questions related to the submission cannot be answered or clarified by the authors through the review process. The situation arises that the submission can be original and novel, but may lack investigations or results. Should I still accept?