'This book is a very welcome addition to literature on outdoor learning in the early years. Sara Knight captures the essence and ethos of Forest School through a detailed consideration of case studies and research projects, and gives a succinct overview of the theoretical underpinnings and history of the movement in the UK. The book also provides useful practical guidance on participating in Forest School, and will be an inspiration to all those concerned with giving young children the opportunity to engage in natural outdoor spaces on a regular basis. Essential reading for both students and practitioners in early childhood!' - Tim Waller, Reader in Early Years Education, University of Wolverhampton
In addition to agreeing with the Aristotelian definition of man as "the rational animal ,"  Aquinas also held various other beliefs about the substance of man. For instance, as the essence ( nature ) of all men are the same,  and the definition of being is "an essence that exists,"  humans that are real therefore only differ by their specific qualities . More generally speaking, all beings of the same genus have the same essence, and so long as they exist, only differ by accidents and substantial form . 
Forest school offers two specific challenges with regards to research. The small number of children, typically 12 to fifteen maximum, in sessions means a number of different programmes would need to be studied in order for any research to include a significant sample size. Forest school is also most effective and has the most profound impact over a long period of time. Unless studies took place over a period of a year or more it would likely not be enough time to be able to accurately assess or judge the long term impact of the programmes being studies.