Sustainable by Design
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independent of the specific thing to be explained’
1
 and is progressed 
through intellectual activity, that is, through reasoning and objective 
understanding. Design practice and aesthetic definition, on the other 
hand, require attention to specifics within the holistic development of a 
particular product, and not ‘general principles independent of the thing 
to be explained’. Critique is an integral part of this designing process, 
and is also applied to the final object. 
The intellectual and aesthetic issues of design, and their relationship, 
provide the basis for creating
, understanding and critiquing products. 
In terms of sustainability, the relationship between theory and 
practice is such that the ethical and environmental imperatives of the 
sustainable rationale can inform the design process and affect the 
intrinsic properties of the product. In turn, this will affect one’s aesthetic 
experience of the product and suggest a basis for sustainable aesthetics. 
I will discuss and illustrate these issues in terms of both the designer’s 
intentions and creative aesthetic sensibility, and the user’s a priori 
knowledge and the aesthetic experience. 
When we set out to design a functional object, a clear understanding 
of intentions and a set of design criteria have to be established. 
The object will have to function effectively
, it must be designed for a 
particular market and manufactured at a certain cost, and it must be 
safe, comprehensible and attractive to the intended user. These factors 
are established before the design work begins and so they represent a 
set of ideas about the object that are extrinsic to any particular design 
outcome. In this sense, the design intentions and criteria are based 
on general ideas and principles and, as such, they are theoretical or 
abstract, they do not have physical or concrete existence. They include a 
broad set of assumptions, knowledge and information about the context 
of production, the types of materials, forms and assembly techniques 
suited to modern mass production and knowledge about similar 
products already on the market. These theoretical ideas, intentions and 
criteria help define an object in terms of its extrinsic properties. It then 
becomes the responsibility of the designer, during the design process, 
to create concepts that bring together and attend to these factors, and 
this eventually results in a specific design. Hence, while intentions and 
design criteria are determined prior to, and independent of, the activity 
of designing, they find their resolution in the final design outcome. They 
are critical to the designer’s decision making, and influence the way the 
final design is established, understood and judged. 
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