An assembly line is a manufacturing  process in which parts are added to a product in a sequential manner using optimally planned logistics to create a finished product much faster than with handcrafting-type methods.An assembly line is designed by determining the sequences of operations for manufacture of each component as well as the final product.

the assembly line methods ,we should know about it .Using modern assembly line methods, manufacturing has become a highly refined process in which value is added to parts along the line. Assembly line manufacturing is characterized by concurrent processes, or multiple parallel activities.A key factor in the development of the moving assembly line is the mechanization of materials handling.

1.  Fold one sheet of construction paper in half lengthwise. 
2.  Place the ruler on the fold line; then, with a pencil, mark one-inch marks down the paper. 
3.  From the edge of the paper, measure over one inch and draw a line down the paper one inch from the edge. 
4.  Take another sheet of construction paper and draw lines at one-inch intervals lengthwise down the paper. 
5.  Cut the paper on these lines. 
6.  Now weave the strips in and out of the other piece of construction paper.

An assembly line can be explained as workers and machines organized into a continuous flow of raw materials that are made into products in an unimaginable scale. when you see the methods of assebly line principle ,you can master it easily.