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This paper contributes towards a multi-paradigm approach for the specification validation verification and refinement of concurrent agile systems. It brings together two complementary rigorous and largely accepted frameworks: Meseguer's true- concurrent Rewriting Logic (RL) with its MAUDE prototype and Lamport's Temporal Logic of Actions (TLA) with its current prototype TLA + . At the specification / validation phase, we adopt a variant of MAUDE that we endow with strategy for controlling rules and state splitting / recombining for exhibiting full intra-concurrency. For the verification / refinement phase, we automatically derive TLA's formulas from validated MAUDE specification, on which crucial properties are checked using TLA's deductions and invariants. A production system is considered as proof-of-concept.