This "Yellow Book" is the second of two manuals comprising the Primary Levels of the CCEP and is an equally important portion of the cognitive enhancement process. Similar to the first manual, there are four levels - A through 3. The levels in each manual have been designed to be approximately equal in difficulty for most students. While the cognitive skills of attention, memory and problem-solving continue to be emphasized, visual spatial and visuo-motor abilities also come into consideration. With the addition of these traits, it is important that the previously trained skills be entrenched into the child's understanding of the program.