Logic is a strange and remarkable branch of philosophy. Surprisingly, it may have more relevance to our field of endeavor than we think. Logic is a problem solving process which through the use of a handful of rules, increases the chances of correct conclusions. The process involves the statement of any number of premises and a conclusion.

One then begins at the conclusion and backtracks to the premises ensuring each step abides by the rules. If you cannot fill in the steps back to the source, the proposed conclusion is incorrect. That is you can't get here from there...