"Form follows Function" The complexity of this type of work and the drive in this movement is to not take the aesthetics as a basis for architecture. However Functionalism very much becomes an aesthetic in itself.
Hannes Meyer: The exterior of the buildings should show and communicate the interior spaces. Functional components are expressive and the use of glass, steel and "light" having a view and connection to "good health". Buildings should showcase their intention and function.
Manifesto: Art is composition / life is function. The extreme view was that architecture should be based primarily on its functional outset. Minimalism starts to come into play but the focus still remains function.
Jurgen Habermas: on modernism and post-modernism.
Functionalism suggests false concepts - It does apply aesthetic rules.
Le Corbusier: "Towards a New Architecture" Epoch [Period] architecture becomes mass produced - morally good for you. Industrial technologies are introduced - these are used as a point of reference both in visual and functional layers.
Adolf Loos: The removal of ornamentation. Keep architecture stripped and simple allowing the interior to showcase its wealth.
Theodor W. Adorno: Purpose free vs purposeful Necessary vs unnecessary [Superfluous] Architecture needs usefulness. Architecture has to be concerned with own set of rules [Raumplan] Each space should be functional to itself.
Umberto Eco: Function and Sign - Denotation vs connotations [referring to other meanings other and above its primary attributes]the connotation related to and about architecture. Even the most functional object arrives with its own set of connotation.
Ralph Ball: Furniture that becomes non-functional making furniture "unusable"
Martino Gamper: Reconfiguration of its original function [The memory of function - Duchamp - the ready made - Conceptual art]
Fischil and Weiss: The way things go [1987 short film] functional products, items, objects put together to create a non-functional outcome.
Simon Starling - Shedboatshed [multiple functions and mobile architecture]
Referring to our own practice about what is its primary function? are we working towards a functional piece of architecture? if so then it needs to work. Apply a set of implied rules that creates issues in the real world and then how do you go on to solve this - The imminent logic