Manual 5-15R (Five-To-Fifteen-Revised)
www.5-15.org › pdf › manuals(2015) Elaboration, validation and standardization of the five to fifteen (FTF) questionnaire in a Danish population sample. Research in Developmental Disabilities, 38, 161-170. doi: 10.1016/j.ridd.2014.12.018 . Online versions of the 5-15R parent and teacher questionnaires at www.5-15.org