The concept of postmodernism

I'm going to start by trying to understand first the concept of postmodernism and then look at the theoretical context of it through Adorno, ,Derrida and Foucalt and Baudrillard.Yet my first aim is to understand the concept of  modernism and its relation to post modernism,and in reality why it came about.
I intend to concentrate on these theorist first as when studying the module, I realised how much of what we see and understand about postmodernism is influenced by their conceptions of it.

'Postmodernism :a mode of thought ,strategy or aesthetic 
style ,which is the 'cultural dominant'(Jameson) of the late 20th century.E.g kitsch in TV soap operas,Hollywood B films...anti-linear ,metafictional ,hybrid and self conscious art forms'.(Dr.M.DenbyPostmodernism:Historical and Critical Contexts 29/9/11)
What can be ascertained from this quote is that we are dealing with a subculture which has come about due to social and historical change,which has in essence influenced the creation of this ideal.Thus it is evident that postmodernism is fulfilling what modernism cannot.As according to Venturi/Jencks architects ,it was seen as a challenge to modernism's universal /a historical aesthetics and it's aesthetic and social uniformity'.
(Denby :Postmodernism:Historical and critical contexts 29/11/11) Thus in this instance architects are challenging the 'human experience', by mixing 'pre-modern traditions as well as elitist and popular art forms.
I think it is important to understand that this art form is encompassing the whole of the arts,thus creating a melting pot of new experiences.
As according to Bell (sociologist) :the term post modern used to describe a historical era and sociocultural conditions.Drawing on structuralism,postmodernism rejects the Enlightenment's autonomous ,coherent subject/self (Descartes 'I think therefore I am' ) '.
(Denby:Postmodernism :historical and critical contexts 29/11/11) 
This is evidently showing that postmodernism therefore affects the natural reasoned concept of looking at things and makes us think in opposition to reality or our view of reasoning.Yet what it also evident that the concept of postmodernism and the crisis of 'humanism' ,is subjective to philosophical thinking a concept I shall explore in my next blog post.