(Look at the magic of connecting cables to desktop computer with 4,3,2,1 formu-la, start from 4 proceed till 1. Now your computer is ready to use).
By connecting the various parts of a computer we can assemble a computer. For the construction activity, students have to use 4-3-2-1 formula.
A system consist of mouse, key board, monitor, CPU, power cables, and connecting cables Students has to connect the four parts of a computer in row 4, using the cables in row 3, through the power cables in row 2 to construct a system.