the scientific productivity of the authors who have published papers in four journals of library and information science from colombia since 1978 to 2009, was analyzed. a total of 555 authors were found; 422 (76%) of them published a single article and 78 (24%) published 2 or more articles. eleven authors were considered as the most productive with 21 and 7 articles respectively. the data was analyzed with the generalized inverse power, inverse generalized gauss poisson, and poisson lognormal models by the maximum likelihood method. the statistical chi-square and k-s tests showed that the three models fit the observed data.