The techno-scientific development has no frontier, but the legal systems still take roots in local and cultural references. French Law is built on a continental model and conveys values and preferences of the French population, including an essential role given to the State and to textual requirements. Until now, French law has been modified to cope with new and emerging technologies issues with the idea that they can be taken one after the other, on the fringes of the classic legal (...) problems. Do the announcement of a convergence between Nanotechnologies, Biotechnologies, the sciences of Information and Cognition (NBIC) change the situation? According to “converging technologies” partisans, a lot of other deep perturbations may occur. Therefore, it could be pertinent to assess the legal implications of NBIC convergence. But trying to do so, a French legal scholar may first feel (and express) perplexity. What is the “convergence NBIC”? To answer, do we have to wonder which reality hides behind the expression or is it necessary to admit that the speeches are here more important to analyze than a hypothetical realization? Does it imply new legal questions? Do we need new methods to enlighten what is at stake? Is it a new challenge, stimulating the imagination of lawyers and legal scholars, or, on the contrary, is it a new illustration of the Economy of the promises, revealing big risks of vain (or inappropriate) intellectual and normative production? This article is dedicated to enlighten the important difficulties which mark out the road towards the answers to the legal questions raised by the “NBIC convergence”. (shrink)