  This paper introduces the template method for computing the first coefficient
of Langlands Eisenstein series on $\GL(n,\mathbb R)$ and more generally on
Chevalley groups over the adele ring of $\mathbb Q.$ In brief, the first
coefficient of Borel Eisenstein series can be used as a template to compute the
first coefficient of more general Eisenstein series by elementary linear
algebra calculations.
