Work is unoriginal if published either by the authors or by someone else. Often the situation is not quite clear-cut, e.g. the work is a slight advance on earlier work, or the presentation makes comparison difficult. Addition of such a comparison might be made a condition of acceptance. Identify the nature of the contribution before deciding on originality. For instance, a technique might be well-known, but the originality may lie in a novel application of it or in an experimental comparison with some other technique.
Presentation covers overall organization, readability and the use of English.
If you do not feel confident, score 0 and please let us know immediately. We hope that we only gave you papers in your area of expertise, but sometimes errors are made or it is not possible to find enough referees with deep expertise. If you feel completely unable to assess a paper then please let us know immediately. If we have enough notice we may be able to find an alternative referee. The overall evaluation should not just be an arithmetic average of the part scores.