One of the goals of AMS is to disseminate research relevant to Montessori education. The AMS Research Committee is publishing this white paper to summarize literature that exists about the effectiveness of Montessori education. Studies of the outcomes of Montessori education are often the ones most frequently requested by legislators, school administrators and even prospective parents. As Montessori education is focused on educating the whole child, research on Montessori outcomes must not be limited to academic outcomes or, even more narrowly, to results of standardized tests. While the United States seems obsessed with standardized assessments as the sole indicator of educational success, Montessori research must participate in but not be confined to these definitions of success. Montessori research has historically been limited, but the number of studies has been increasing in recent years. Many of the more current articles discussed later in this paper balance academic as well as socio-emotional outcomes of Montessori education