Constitutes the thoroughly refereed post-proceedings of the 18th International Workshop on Implementation and Applications of Functional Languages, IFL 2006, held in Budapest, Hungary, in September 2006. This work contains papers that address various theoretical and methodological issues on functional and function-based languages.

On Optimising Shape-Generic Array Programs Using Symbolic Structural Information.- Index Vector Elimination – Making Index Vectors Affordable.- Functional–Based Synthesis of a Systolic Array for GCD Computation.- Comparing Alternative Evaluation Strategies for Stream-Based Parallel Functional Languages.- Parallel Coordination Made Explicit in a Functional Setting.- Low-Level Programming in Hume: An Exploration of the HW-Hume Level.- A Conference Management System Based on the iData Toolkit.- A Pattern Logic for Prompt Lazy Assertions in Haskell.- Ivor, a Proof Engine.- Proving Program Properties Specified with Subtype Marks.- Uniqueness Typing Redefined.- Heuristics for Type Error Discovery and Recovery.- Testing Properties of Generic Functions.- Worst-Case Execution Times for a Purely Functional Language.- Automatic Partial Inversion of Inductively Sequential Functions.

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