The postmodern view involves the rejection of modern assumptions about order and the universality of truth.
Conclusion (it follows that)
We inhabit a world full of irregular events, in which there are no universal truths.
Evidence
The postmodern view involves rejecting modern assumptions about there being order to the universe or universal truths.
The grand theories of the modern era are now sees as limited by the contexts of their time periods.
The belief in order has given way to a belief in the importance of irregularity and chaos.
Evaluate
This argument appears to just be acting as though the postmodern view is reality.
Why should we accept postmodernism's description of the world? So what if they say the universe doesn't have order or universal truths. What makes them the experts on reality?
Even within the context of this argument, we can see that stuff we happen to believe at one time (such as the grand theories we used to believe) we might later come to doubt.
So who says that it will be any different when it comes to postmodernism? Maybe there will be an intellectual movement after postmodernism that says that the stuff postmodernists were saying was wrong and was just limited by the social and historical context in which it was elaborated?
There's a small pattern of arguments that have a He Said / She Said structure, where the author seems to arbitrarily side with one view over the other, without justifying it.
Grand Theories say that there are universal truths and order (there's an RC passage on these in PT82 that gives examples like Freudians thinking that everything comes back to repressed feelings about our moms, or Marxists thinking that everything comes down to the elites exploiting the working class).
Postmodernists say that there aren't universal truths or order.
The author is acting like we live in the world described by the postmodernists, but who said they're correct?
Goal
Let's look for an answer saying that the author is treating the Opinion of the postmodern view as though it's Fact. The author is ignoring that belief systems change over time, so there's no reason to think that the current one (postmodernism) is the correct one. And the author is arbitrarily siding with one view over another, without justifying that preference.