The very term 'poststructuralism' is not uncontested.
In addition to work which engages directly with specific philosophers poststructuralist thinkers have developed distinctive forms of analysis (grammatology, deconstruction, archeology, genealogy, semanalysis) and often developed these forms as critiques of specific institutions (family, state, prison, clinic, school, factory, armed forces, university, even philosophy itself) and theorizations of a range of different media ("reading", "writing", teaching, television, the visual arts, the plastic arts, film, and forms of electronic communication).
Structuralism in Literature: An Introduction.

An Introductory Guide to Post-Structuralism and Postmodernism.
Poststructuralist thought has developed a range of different methods or approaches (e.g., "archeology", "genealogy", "deconstruction") that operate according to their own logics but tend to emphasize the notions of difference, local determinacy, historical breaks or discontinuities, serialization, repetition, and a "dismantling" or "disassembling" (read deconstruction) critique.
Deconstruction in Context: Literature and Philosophy.
Both structuralism and poststructuralism take up the Saussurean belief -- and innovative methodologies based upon its insights -- that linguistic signs act reflexively rather than referentially.

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So we can conclude that the process of recognising commonalties between postmodernism and structuralism - as reactions against modernism - etymologically speaking, begin quite late in the piece.
Beowulf and Poststructuralist Theory Authors
An influential definition of postmodernism and one of the most debated comes from the poststructuralist thinker, Jean-François Lyotard, who in his celebrated (
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He suggests that the status of knowledge is altered as societies enter the postindustrial age and cultures enter the postmodern age, actively indicating a structural homology between changes to the economic and cultural modes without assigning priority to one over the other.