1-Duck Rule: If it walks like a duck, squawks like a duck and has feathers, it probably is a duck.
2–Sherlock’s Rule: When considering a problem, remove everything from consideration which seems untrue. What is left is probably the truth.
3-Occam’s Razor: In considering a complex phenomenon with many factors and a variety of explanations, remember that the simplest explanation that accounts for the factors is probably correct.
4- The KISS principal” “Keep it Simple, Stupid.” (Army Rule) pl