Increase in Number of Authors Per Article in Ten American Psychological Association Journals: 1960-1980

In an attempt to empirically verify informal observations of an increase in the number of authors per article in psychological journals, the current study analyzed the average number of authors per article in 10 APA journals over the past 20 years. A significant increase in number of authors was demonstrated. These observations raise important questions regarding possible changes over time in the process of establishing authorship