If I were allowed to select only one NCD principle and declare it my "favorite principle” (though I told you that we should never do that), I definitely would choose this one: the growth force of energy transformation. The power behind this principle is so dramatic that I can only assign it to the fact that God himself has designed it in his wisdom...
This is a picture of the windmills behind our house in Emmelsbüll, Germany. Actually, these windmills don't produce energy; they just transform the energy that is plentifully available in our area: wind. In our part of Germany, we usually experience the wind as "hostile energy.” The windmills transform it into useful energy: electricity...
Excerpts from Color Your World with Natural Church Development - Christian A. Schwarz
Since it is called an NCD Church Survey, the answer to the question "whose survey results are they?” would seem obvious.