Elsevier, a major publisher of journals, says: "A special issue focuses on a specific area of research that has a broad appeal and falls within the aims and scope of the journal. A special issue also provides an excellent opportunity to review a particular theme, examine previously unaddressed aspects, propose and develop new approaches, exchange perspectives and encourage new lines of research. Special issues might also be commissioned or proposed to recognize a particular individual's or group's contribution to the field or to commemorate a specific date or occasion."

Taylor & Francis, another journal publisher, says: "A special issue is an issue of your journal dedicated to one chosen topic. It should contain the latest work on that subject. And if you create a special issue well, it can be a unique and valuable reference source for every researcher interested in that area."