Composing specifications using communication
ZB'03 Proceedings of the 3rd international conference on Formal specification and development in Z and B
Formal model-driven development of communicating systems
ICFEM'05 Proceedings of the 7th international conference on Formal Methods and Software Engineering
Formal service-oriented development of fault tolerant communicating systems
Rigorous Development of Complex Fault-Tolerant Systems
Formal modelling and verification of service-oriented systems in probabilistic event-b
IFM'12 Proceedings of the 9th international conference on Integrated Formal Methods
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Telecommunication systems should have a high degree of availability, i.e., high probability of correct provision of requested services. To achieve this, correctness of software for such systems and system fault tolerance should be ensured. In our previous work we proposed an approach to formalisation and extension of Lyra --- a top-down service-oriented method for development of communicating systems. Lyra is based on transformation and decomposition of models expressed in UML2. We formalised Lyra in the B Method by proposing a set of formal specification and refinement patterns reflecting the essential Lyra models and transformations. At the same time, we also focused on integration of fault tolerance mechanisms into the entire Lyra development flow. In this paper, we extend our Lyra formalisation to model parallel execution of services. This significantly increases both complexity and flexibility of the presented models.