  The component approach aims for the reuse by a coherent and easy components
assembly. But obtaining a coherent components assembly is not an easy exercise.
To achieve this, we advocate a contractual approach distinguishing different
syntactic, structural, semantic, synchronization and service quality contracts.
We have successfully applied this approach on two models of semi-formal
contractual components: UML2.0 and Ugatze. Indeed, we propose two approaches:
VerifComponentUML2.0 and VerifComponentUgatze. The VerifComponentUML2.0
approach aims the verification of syntactic, structural, synchronization and
quality service contracts on a UML2.0 component assembly through two formal
component models Acme/Armani and Wright. VerifComponentUML2.0 has two tools:
Wr2fdr and Wright2Ada. The tool Wr2fdr allows translating Wright expression to
CSP contracts in order to verify synchronization using the model checker FDR.
It is a IDM tool Wright2Ada which allow is transforming Wright code to Ada, in
order to open UML2.0 on static analysis and dynamic tools associated with Ada.
VerifComponentUgatze approach provides a frame allowing to check syntactic and
structural contracts of an Ugatze component assembly through Acme/Armani.
