level4dWhat Is the CAT4 Level D Test for Year 7? The Cognitive Abilities Test, or CAT4, is an assessment taken by students aged 6 to 17 in the United Kingdom and Republic of Ireland to access the child’s potential.. It provides anHere we explore 3D, 4D, 5D and 6D Building Information Modelling (BIM) and show how adding extra information can make for more timely decisions and ultimately better buildings.