A review and intercomparison is conducted of data on various morphologically-chosen groups of irregular galaxies in order to understand the underlying physical mechanisms that differentiate these systems. Particular attention is given to the observational clues to the stellar content, star-formation processes, and star-formation histories of these galaxies, with an emphasis on the uncertainties and the many unanswered questions.
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Deidre A. Hunter (1986) studied this question.