Marketing today is increasingly complex Marketers are confronted with problems of: Selecting message when consumers demand and expect personalized messages greater effectiveness Targeting: customer knowledge makes it possible to tailor this, or at least, eliminate targets that are not interested. Selecting the channel: or in fact chosing the cross-channel strategy what and how, what synergies can we achieve??? But the question "what is the right time?" has been a little bit left to one side.