The Planning, Attention-Arousal, Simultaneous and Successive (P.A.S.S.) theory of intelligence, first proposed in 1975 Das, Kirby, and Jarman (1975), and later elaborated by Das, Naglieri & Kirby (1994) and Das, Kar & Parrilla (1996), challenges g-theory on the grounds that the brain is made up of interdependent, but separate, functional systems. Neuroimaging studies and clinical studies of individuals with brain lesions make it clear that the brain is modularized; for example, damage to a very specific area of the left temporal lobe will impair the production (but not the comprehension) of spoken and written language. Damage to an adjacent area will have the opposite impact, preserving the individual's ability to produce, but not understand speech and text. The PASS (Planning, Attention, Simultaneous and Successive cognitive processing) theory of intelligence identifies three operational units that are important to understand mental functioning: attention, simultaneous and successive processing, and planning. The PASS theory of intelligence is based on the psychological work of A.R.Luria. The P.A.S.S. model is an alternative approach to measuring and studying intelligence. Description Based on A. R. Luria's (1966) work on modularization of brain function, and supported by decades of neuroimaging research, the PASS Theory of Intelligence proposes that cognition is organized in three systems and four processes. The first process is Planning, which involves executive functions responsible for controlling and organizing behavior, selecting and constructing strategies, and monitoring performance. The second is the Attention process, responsible for maintaining arousal levels and alertness, and ensuring focus on relevant stimuli. The two processes, Simultaneous Processing and Successive Processing encode, transform, and retain information. Simultaneous processing is engaged for determination of the relationship between items integration into whole units of information is required. Examples of this include recognizing figures, such as a triangle within a circle vs. a circle within a triangle. Successive processing is required for organizing separate items in a sequence such as remembering a sequence of words or actions exactly in the order in which they had just been presented. These four processes are hypothesized to functions of four areas of the brain. Planning is broadly located in the front part of our brains, the frontal lobe. Attention and arousal are combined functions of the frontal lobe and the lower parts of the cortex, although the parietal lobes are also involved in attention as well. Simultaneous processing and Successive processing occur in the posterior region or the back of