Yes, it is a validated and reliable instrument. The statistical studies demonstrating this are included in the article published in 2016 in the journal Schizophrenia Research. In fact, some research groups use it and have used it, especially to detect risk factors at the outset of investigating the presence of disorders in general or affected populations. This is commonly referred to as premorbid social adjustment. It is also useful in studies of populations with severe mental disorders to systematize the exploration of the adverse circumstances associated with the onset of these disorders. It is also used in early childhood services for the early detection and prevention of alterations in bonding and attachment.