Combinators and classes -- Least fixed points revisited -- Infinite normal forms for the ?-calculus -- A survey of some useful partial order relations on terms of the lambda calculus -- ?-Terms as total or partial functions on normal forms -- Continuous semantics and inside-out reductions -- An algebraic interpretation of the ??K-calculus and a labelled ?-calculus -- Les modeles informatiques des ?-calculs -- On the description of time varying systems in ?-calculus -- Unification in typed lambda calculus -- A condition for identifying two elements of whatever model of combinatory logic -- Typed meaning in Scott's ?-calculus models -- Programming language semantics in a typed lambda-calculus -- Big trees in a ?-calculus with ?-expressions as types -- Normed uniformly reflexive structures -- A model with nondeterministic computation -- On subrecursiveness in weak combinatory logic -- Sequentially and parallelly computable functionals -- Computation on arbitrary algebras -- On solvability by ?I-terms -- Some philosophical issues concerning theories of combinators -- Open problems.