fuller satisfaction in living and working. They credit these results to
their study and continued use of "The Selling Process." The value of
that book will be at least doubled by the supplemental reading of
"Certain Success." Therefore the two are now published as a set of
working tools for any ambitious man or woman who is resolved to _earn_
success.

NORVAL A. HAWKINS

Majestic Building,
Detroit, Michigan.




CHAPTER I

_The Universal Need For Sales Knowledge_


[Sidenote: Analysis of Secret of Certain Success]

The Secret of Certain Success has four principal elements. It comprises:

(1) Knowing how to sell

(2) The true idea

(3) Of one's best capabilities