  We reconstruct the action of $N=1, D=4$ Wess-Zumino and $N=1, 2, D=4$
super-Yang-Mills theories, using integral top forms on the supermanifold ${\cal
M}^{(4|4)}$. Choosing different Picture Changing Operators, we show the
equivalence of their rheonomic and superspace actions. The corresponding
supergeometry and integration theory are discussed in detail. This formalism is
an efficient tool for building supersymmetric models in a geometrical
framework.
