[en] A collective formalism first proposed by Deal to describe isoscalar dipole excitations in electron scattering is extended to include excitations of these modes by hadron scattering. Distorted-wave Born approximation calculations are performed using this collective isoscalar L = 1 form factor to describe the excitation of the 1^-, T = 0 state at E/sub x/ = 7.12 MeV (1hw character) in ¹⁶O and a newly proposed candidate for the isoscalar giant dipole resonance (3hw character) at E/sub x/ = 21.3 MeV in ²⁰⁸Pb excited in inelastic a scattering. A good description of the cross sections of the 1^-, 7.12 MeV state in ¹⁶O and the E/sub x/ = 21.3 MeV bump in ²⁰⁸Pb is obtained in this model exhausting 4.2% and 130% of the energy-weighted sum rule, respectively