The workshop Computer Science Logic '90 was held at the
Max-Planck-Haus in Heidelberg, Germany, October 1-5, 1990.
It was the fourth in a series of worskhops, following CSL
'89 at the University of Kaiserslautern (see LNCS 440), CSL
'88 at the University of Duisberg (see LNCS 385), and CSL
'87 at the University of Karlsruhe (see LNCS 329). This
volume contains 24 papers, chosen by means of a review
procedure from the 35 papers presented at the workshop, some
of which were invited and some selected from a total of 89
submissions. The papers cover a wide range of topics arising
from the applications of logic to computer science.