Such a program cannot spring into being overnight and must evolve 
from smaller pilot programs, but it is also evident that this evolution 
must be consciously planned in light of evolving understanding of the 
problems. Therefore, instead of proposing immediate organization 
of resources for undertaking a very large program of measurement, 
the immediate task as we see it is to set out a series of experiments in 
steps. 
The following diagram indicates roughly how these might be 
scheduled. 
ri7 
