The main activity at Level B centres around the prediction-by-analogy
method [e.g. 4]. This uses data on the characteristics of species' existing
locations to help seek other places where the species might grow well.
Considerable advances have been made with this technique through the use of explicit methods for describing and checking species' locations and
estimating some potential locations [5], but whilst these methods are of
undoubted value for suggesting species for particular environments, they
remain analogue methods and do not elicit environmental relationships
from which performance can be formally estimated.