Millions of dollars are expended, in the USA and elsewhere, to provide paraprofessionals or "teaching assistants" for regular early childhood classrooms. However, little consistent information exists related to best practice in the use of paraprofessionals in these early childhood settings. This article describes a study employing the use of 159 teacher and 161 paraprofessional surveys and classroom observations in 23 randomly selected kindergarten and four-year-old classrooms. Paraprofessionals delivered large amounts of group instruction and frequently managed student behavior. Furthermore, it was found that a lack of understanding of specific duties and expectations related to the roles of paraprofessionals was characteristic of both teachers and the paraprofessionals themselves. (Contains 5 tables.)