This deliverable describes the development of the model checking tool for IaC in the PIACERE project. Two prototype model checkers are presented. The first one targets the TOSCA IaC specification language and has been developed as a proof-of-concept for evaluating different possible model-checking backends. The second one is targeted to the PIACERE DOML specification language in one of its current form, still at an early development stage. It will be further implemented by exploiting the insights learned from the first prototype. The work described in this deliverable contributes to KR4 from WP4.