Constitutes the refereed proceedings of the 8th International Symposium on Functional and Logic Programming, FLOPS 2006, held in Fuji-Susono, Japan, in April 2006. This work contains papers that are organized in topical sections on data types, FP extensions, type theory, LP extensions, analysis, contracts, as well as Web and GUI.

Invited Papers.- Parallel Programming and Parallel Abstractions in Fortress.- Convergence in Language Design: A Case of Lightning Striking Four Times in the Same Place.- Refereed Papers.- “Scrap Your Boilerplate” Reloaded.- Ruler: Programming Type Rules.- A Framework for Extended Algebraic Data Types.- Lock Free Data Structures Using STM in Haskell.- XML Type Checking Using High-Level Tree Transducer.- A Computational Approach to Pocklington Certificates in Type Theory.- Defining and Reasoning About Recursive Functions: A Practical Tool for the Coq Proof Assistant.- Soutei, a Logic-Based Trust-Management System.- A Syntactic Approach to Combining Functional Notation, Lazy Evaluation, and Higher-Order in LP Systems.- Resource Analysis by Sup-interpretation.- Lazy Set-Sharing Analysis.- Size-Change Termination and Bound Analysis.- Typed Contracts for Functional Programming.- Contracts as Pairs of Projections.- iData for the World Wide Web – Programming Interconnected Web Forms.- Crossing State Lines: Adapting Object-Oriented Frameworks to Functional Reactive Languages.- WASH Server Pages.