This deliverable reports on the validation of the CDD method and CDD environment tools done by applying them in the CLMS use case as part of WP3. The validation addresses four areas. Firstly, the use case goals (defined in D3.2) are revised and their fulfilment is examined. Secondly, questionnaires have been used to examine the CDD methods usefulness, ease of use, ease of transfer and the user’s intention to use the method. Similarly, questionnaires has been used to evaluate the CDD environment in the form the of CDT, CPP and CNA tools. Thirdly, a use case checklist has been produced that describe the current state of the implementation. Fourth, experiences and points for improvements have been documented based on the work within the use case. The validation has shown that the CDD methodology and tools have been successfully used in the use case. The use case goals have been met, either by means of the implementation done with the CDD environment, or indirectly by the use of the CDD methodology. Even though the CDD methodology and environment used in the case was not the final ones, the questionnaires show that the CDD methodology and environment have been used and are deemed of high usefulness in the case. Points for future improvement have been documented for both the method and tools. To some extent the special needs of method components have been covered by method extensions already suggested by the WP3 participants. The use case checklist shows that support for the three identified capabilities has been implemented with the use of the CDD environment components, namely, CDT, CCP and CNA.