This is the seventh in a
projected series of papers in which we plan to come to grips with the Selberg trace
formula, the ultimate objective being a reasonably explicit expression. As the title
suggests, our goal in this work is to prepare the stage for the complete delineation of
the contribution to the trace coming from the continuous spectrum, concentrating
here on the role played by the truncation process. In our next publication, we shall
finish the investigation, setting down the precise form of the various terms in all
detail.