Theory in architecture?what is it?

I THINK,ARCHITECTURE BASICALLY NOT DEPENDS ON AN EARLY THEORY FOR IT TO BECOME A PROFESSIONAL CARIER NOWADAYS..

'Beauty is truth, truth beauty, - that is all Ye know on earth, and all ye need to know.'
John Keats, Ode to a Grecian Urn

The role of architecture is ... to make utilitarian structures. Beauty can be added to it, but at
this point it becomes similar to other visual arts - you may see a building as beautiful
as a painting, but that doesn't make the building in itself a piece of art! It is not the building as such which is artistic, but some aspects of its form.

As Tom Wolfe points out so hilariously in The Painted Word, in much modern 'art' the theory itself is the art - the so-called artworks themselves are distinctly secondary. Torres and Kamhi fall into this trap by discussing at length assorted theories about architecture, while forgetting that arguments about art and architecture actually require 'fieldwork' - experience and understanding of the artworks themselves and discussion about particular concrete examples. Metaphorically speaking, these theorists are like Goethe studying optics - they never leave their own armchair. Their fieldwork is undone, and their conclusions as a consequence are mistaken.Instead of a wealth of examples of architecture, theorists such as Batteau, D'Alembert, Alberti, the Kantian Roger Scruton and others are wheeled on and their weak architectural theories summarily dismissed; buildings themselves appear only as an uncomfortable and awkward intrusion and are mentioned only clumsily and in passing. The failing is not in this chapter alone, but is a common fault throughout their book. One senses that, unlike Alexandra York who seems to revel in experiencing fresh new artworks, they instead prefer to talk about art than to experience it. This fault, I submit, leads them directly to their mistaken ideas about architecture.

I TOOK THE ABOVE INFORMATION FROM THE INTERNET AND AFTER I READ AND UNDERSTAND THE PARAGRAPHS I CONCLUDE THAT ARCHITECTURE IS NOT A THEORY BUT AN APPLICATION..

BUT EVERYBODY HAVE THEIR OWN OPINION ABOUT WHAT TEORY IN ARCHITECTURE MEANS..THESE,IS WHAT I ONLY UNDERSTAND ABOUT IT..