This volume contains selected papers presented at theseventeenth Colloquiumon Trees in Algebra and Programming(CAAP) held jointly with the European Symposium onProgramming (ESOP) in Rennes, France, February 26-28, 1992(the proceedings of ESOP appear in LNCS 582). The previouscolloquia were held in France, Italy, Germany, Spain,Denmark and England. Every even year, as in 1992, CAAP isheld jointly with ESOP; every other year, it is part ofTAPSOFT (Theory And Practice of SOFTware development). Inthe beginning, CAAP was devoted to algebraic andcombinatorial properties of trees and their role in variousfields of computer science. The scope of CAAP has now beenextended to other discrete structures, like graphs,equations and transformations of graphs, and their linkswith logical theories. The programme committee received 40submissions, from which 19 papers have been selected forinclusion inthis volume.