Newton's laws of engineers

Law -1.
Every Engineer continues his state of chatting or
forwarding mails unless he is assigned work by
external (mentally)unbalanced manager.

Law -2.
The rate of change in the Work is directly
proportional to the payment received from client and
takes place at the quick rate when deadline force is
applied.

Law -3.
For every Use Case Manifestation there is an equal
but opposite Work Implementation.

Bonus Law 4.
Mistakes can neither be created nor be removed from
drawings by an engineer.
It can only be converted from one form to another.
The total number of mistakes in the drawing always
remains constant.