This paper examines the use of informal training for workers, by Australian companies and other organisations. Using survey data, it reports the prevalence of informal training and also the utilisation of different types of informal training. Differences are found by employer size, particularly for the different types. By examining qualitative responses, it is found that employers' perceptions of informal training are often not those reflected in existing literature. The paper therefore argues for a new definition of informal training which is comprehensible to employers and workers alike, so that more, and more reliable, research can be undertaken.