In order to get started with neurofeedback, an assessment needs to be done to evaluate brain function. One of the assessments, the one that documents inefficient brain wave patterns, is called a quantitative electroencephalogram (QEEG) or brain map. A cap embedded with sensors is placed on the head and then measures the electrical signals coming from the brain. Sophisticated computer software analyzes the signals and produces a map of the surface of the brain that illustrates the areas of inefficiency. This map, along with the other assessments, is used to determine the specific areas of the brain to train and the approximate number of sessions that may be needed.