We investigate Scattering-Rates due to the electron–phonon interaction in a Semiconductor Heterostructure (SH) on the basis of a phenomenological theory for Polar Optical Phonons (POP) in semiconductor nanostructures which was proposed in the latter times. The applied theory has led to a plausible description of POP in Quantum-Wells, Quantum-Wires and Quantum-Dots. Using this theory we find an explicit expression for the electron–phonon Hamiltonian with direct application to a SH. Scattering Rates are calculated by applying this Hamiltonian and also a realistic wave-function for the electron states (using Airy functions) is considered. The obtained results are discussed in detail and compared with previous works on the subject.