Thales Group designs, develops, produces, supports, operates innovative solutions in large and various domains (Aerospace, Space, Defence, Aerospace, Ground Transportation, Security, etc.) where the operational performances are more and more critical. In this context, to ensure competitiveness and remain leader on the market, Thales has investigated in an extension of the recommended Integrated Product and Process Development approach (see [DoD IPPD], [INCOSE SE HB], [CMMI]), applied for

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... lopment towards a "Co-Engineering approach" addressing all stages and concerns of the operational system as a key lever of efficiency and SE benefits achievement. This paper presents the implementation in Thales of this Co-Engineering approach identifying major principles to be mutually agreed and applied (on Technical and Organisational aspects) per System Life Cycle stage, necessary changes to be led, and finally, an illustration by typical scenarios as Returns of Experience.