on to that book. When you have read "The Selling Process"
once, start "Certain Success" and master it. Then re-read the other book
in the light of the new ideas that will have been shed upon its contents
by the present text.

The practical value of "Certain Success" and "The Selling Process" to
you as a salesman will be multiplied a hundredfold if both are kept
handy for _continual reference_. The marginal index should enable you to
find quickly any point regarding which you want to refresh your
recollection. This set of books was not written to collect dust on a
library shelf. No salesman can get the full worth out of the pages
unless he _uses_ "Certain Success" and "The Selling Process" _as working
tools_.

[Sidenote: If Your Vocation Is Not Selling]

If you are not engaged in selling as a vocation, and have not realized
before that you must be a good salesman or saleswoman in order to
achieve your life ambition, commence mastering the secret of certain
success with the selling process by reading thoroughly the book now in
your hands. This preliminary study will increase your ability to read
intelligently the more technical contents of "The Selling Process." Do
not skip or slight any portion of either book. You cannot afford to miss
a single bit of information regarding the sure way to succeed.

* * * * *

[Sidenote: Purpose and Scope of the Two Books]

This is the first publication of "Certain Success," but five large
editions of "The Selling Process" were required in 1919 and 1920 to
supply the demand from all over the world. The two books, each complete
in itself, now are issued together under the double title, CERTAIN
SUCCESS WITH THE SELLING PROCESS; though either "Certain Success" or
"The Selling Process" may be ordered alone.

My chief purpose in preparing this set has been to stimulate each
reader's comprehension of the value of skillful salesmanship _to him_.
All of us who are ambitious to make the most of the best that is in us
need to be first-class salesmen, whether we market "goods" or our
personal capabilities. As has been emphasized repeatedly in this
preface, _every one who would succeed in life must know HOW to sell his
qualifications to the highest advantage_. Poor salesmanship is
responsible for most of the failures of people who really _deserve_ to
succeed. It is almost surely fatal to ambitious hopes in any trade,
profession, or business.

CERTAIN SUCCESS W