This report covers the period 1 July 1984 to 30 June 1987 and - as usual - has been prepared by the President, Vice-President, members of the Organizing Committee and the chairpersons of the Working Groups. There has been emphasis on highlights rather than on completeness of references. In comparison with earlier reports one section (Galactic Dynamics) has been added, but otherwise the same line of reporting has been used. For readability and quick reference, in general abbreviated notation for literature references to major journals have been used; more complicated ones usually follow the code of Astronomy and Astrophysics Abstracts. The abbreviation et al. has been replaced by the symbol +.