The word “grammatology” literally signifies the “science of writing.” One must acknowledge, however, that this science has never existed. Derrida's book Of Grammatology proposes to elaborate and to implement just such a project. Why has this grammatological project never been accomplished? For Derrida, “writing”1 can no longer simply designate a technique for the notation of speech. A distinction should be made, then, between “narrow” and “enlarged” meanings of writing. Indeed, is the extension of the concept of writing the work of (...) writing itself or must one suppose that the “modifiability” of the concept is not of the order of writing? This essay will propose that an original modifiability, not reducible to the single operation of writing, is initiated from the beginning as well. I call this modifiability “plasticity.” “Plasticity of writing” would then be the paradox inherent in the redefinition of writing itself that may explain the “failure” of any “grammatology.”. (shrink)