Computer-Aided tools can be used to enhance knowledge delivery in teaching engineering and science subjects. Signals, System Analysis with Matlab and PSpice is written for undergraduate students of Second Year whose major is in Electrical Engineering, Computer Engineering and Applied Sciences in order to provide them with adequate materials for understanding advanced courses. The Analog Behavior Modeling (ABM) library in PSpice can be used for creating a blend of system level and circuit level simulations. The Analog Behavior Modeling (ABM) library in PSpice can be used for creating a blend of system level and circuit level simulations.