This volume contains the invited and contributed papers presented at the 4th Workshop on Perspectives in Nuclear Physics at Intermediate Energies held at the ICTP, Trieste, between 8-12 May 1989. The presentations are grouped into 8 chapters: QCD and the Structure of Nucleons and Nuclei (4 papers), Nuclear Processes at High Energy and Momentum Transfers (6 papers), Theoretical and Experimental Perspectives (4 papers), The Nuclear Wave Function (5 papers), Electron Scattering and Nuclear Structure (10 papers), Photonuclear Processes (5 papers), Excitation of Nucleon Resonances (8 papers), Antinucleon Physics (4 papers). A separate abstract was prepared for each of these papers. Refs, figs and tabs.