Suppose we say that we want to send our missionaries where they are most needed, what information must we have to direct us?
First we must know what we mean by need, what kind of need we are to put first in our thoughts; that is the question of definition of aim.

Then, how shall we decide where that need is greatest at the present time, for us, that is, within our possibility of active assistance; that is the question of relation.

The facts of need as we define it must be related and compared.

The survey of which we speak as necessary for an intelligent understanding of foreign missions must provide these facts in a form easily grasped and understood and compared for different countries and districts, so that those who direct action and those who support the action may be able to do so with reason, not being guided merely by the most influential voice or the loudest shout.
6.

To serve this purpose survey must have twofold aspect.