This project involves the designing, in detail, of an implementable Electric Very Large-Scale Integration (VLSI), of a 4 – bit Arithmetic Logic Unit (ALU) and simulating it using Electric CAD. The design project has different logic gates that will aid in the design of ALU. The designed ALU will also have some extra outputs, they are cout (which is the value of C) and V. These are responsible for carry and deal with excess during addition, absolute and subtraction. The technology used here is CMOS and MOSIS technology.