Electron repulsion and spin properties of π-electrons are explicitely considered in Pople's SCF-theory; in the ω-method electron interaction is included in a simple way, but there is no physical justification for this procedure. In this paper we describe an LCAO-method (ωrs-method), in which π-electron repulsion is explicitely included and spin properties are neglected. Bond lengths, dipole moments, ionisation energies are calculated, and an explanation of the Scheibe phenomenon is given.