“Function and purpose define architecture as a practical arrangement, while form defines architecture as a manifestation of apparition. The world of appariation that we cannot exist without (Max Horkheimer), is a psychological issue related to form.”

Man and Space - Mensch und Raum 2005

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Justus Dahinden6

Swiss architect 1925

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“Form - as a pattern of perception - can motivate the use of architecture. Architecture provides a complete service for its users, if function (practical purpose) coincides with use motivated by form.”

Justus Dahinden (1925) Swiss architect

Man and Space - Mensch und Raum 2005

“The architecture of a system can be defined as the functional appearance of the system to the user.”

Gerrit Blaauw (1924–2018) Dutch computer scientist

Blaauw (1972) cited in: Gerritt A Blaauw (1976) Digital system implementation. p. 6

“In computer design three levels can be distinguished: architecture, implementation and realisation; for the ﬁrst of them, the following working deﬁnition is given: The architecture of a system can be defined as the functional appearance of the system to the user, its phenomenology.”

Gerrit Blaauw (1924–2018) Dutch computer scientist

Although the term architecture was introduced only ten years ago in computer technology (Buchholz), the concept of architecture is as old as the use of mechanism by man. When a child is taught to look at a clock, it is taught the architecture of the clock. It is told to observe the position of the short and the long hand and to relate these to the hours and the minutes. Once it can distinguish the architecture from the visual appearance, it can tell time as easily from a wrist watch as from the clock on the church tower.
The inner structure of a system is not considered by the architecture: we do not need to know what makes the clock tick, to know what time it is. This inner structure, considered from a logical point of view, will be called the implementation, and its physical embodiment the realisation.
Source: Computer architecture (1972), p. 154

“‘Architecture’ may at first appear to be a more fixed and finite term. It has a threedimensional, tangible, useable form. But questions remain about what can be considered architecture and what cannot, and by this I mean that we usually understand architecture to incorporate aesthetic as well as functional consideration into its structure. Anything that does not fall into this category can be described as ‘just a building’. This may seem too simple. Can architecture be determined solely by the use of refined architectural style – high or polite architecture instead of vernacular?”

Dana Arnold (1961) Middlessex uni prof

Source: Reading Architectural History (2002), Ch. 1 : Reading the past : What is architectural history?

“Architecture is defined as the art and science of creating buildings. Systems engineering may be similarly defined as the art and science of creating systems.”

Derek Hitchins (1935) British systems engineer

Source: Advanced Systems Thinking, Engineering and Management (2003), p. 309; partly cited in: Kurt A. Richardson, Wendy J. Gregory, Gerald Midgley (2006) Systems Thinking and Complexity Science. p. 39

“The software architecture of a system or a family of systems has one of the most significant impacts on the quality of an organization's enterprise architecture. While the design of software systems concentrates on satisfying the functional requirements for a system, the design of the software architecture for systems concentrates on the nonfunctional or quality requirements for systems. These quality requirements are concerns at the enterprise level. The better an organization specifies and characterizes the software architecture for its systems, the better it can characterize and manage its enterprise architecture. By explicitly defining the systems software architectures, an organization will be better able to reflect the priorities and trade-offs that are important to the organization in the software that it builds.”

Scott W. Ambler (1966) Canadian software engineer/consultant/author

James McGovern, Scott W. Ambler and M. E Stevens (2004) A Practical Guide to Enterprise Architecture. p. 35

“The design of a digital system starts with the specification of the architecture of the system and continues with its implementation and its subsequent realisation… the purpose of architecture is to provide a function. Once that function is established, the purpose of implementation is to give a proper cost-performance and the purpose of realisation is to build and maintain the appropriate logical organisation.”

Gerrit Blaauw (1924–2018) Dutch computer scientist

Source: Specification of Digital Systems (1978), p. 29