Enterprise Architecture 2

1
A rock pile ceases to be a rock pile the moment
a single man sic contemplates it, bearing
within him the image of a cathedral - Antoine
de Saint Exupery, author and aviator (1900-1945)
2
What is Architecture?

• Architecture is the art and science of building.
  (dictionary)
• Architecture deals with form, space and order in
  the conceptual, perceptual and physical
  expression. F. Ching
• Architectural design reconciles function, form,
  economy and time
• ...architecture is the total of mans man-made
  physical surroundings sic - Eero Saarinen

3
What is the purpose of Architecture?

• The purpose of architecture is the design of
• Space
• organization, pattern relationships, hierarchy
• Structure
• form, scale, proportion
• Enclosure
• surface, shape, opening

4
What is the purpose of Architecture?

• experienced through movement in space time
• approach entry, path configuration, sequence of
  spaces
• achieved by means of
• technology - tools, techniques and materials
• accommodating a program
• user requirements, legal restraints, economic
  factors, social/cultural factors
• compatible with its context
• sensory, site environment
• - Ching

5
Building Architecture

• Thousands of years of evolution
• Repeatable (standards) solutions
• Best practices
• Pattern language
• Blueprints
• Licensed professionals

6
Information Systems Architecture

• a blueprint that provides the top-down
  structure into which data and systems must fit
  (Parker/Trainor/Benson)
• ...the framework upon which applications are
  designed and implemented. (Boar)
• ...the blueprints, drawings or models...which
  define and describe what is needed...design and
  implementation work is initiated after
  architecture (Spewak)
• A framework for overall information systems
  design describing applications, data and
  technology

7
The Zachman Information Architecture Framework
8
Words of wisdom

• Always design a thing by considering it in its
  next larger context - a chair in a room, a
  room in a house, a house in an environment,
  an environment in a city plan. - Eero Saarinen

9
Information Architecture to Enterprise
Architecture

• Information Architecture is like building a
  building like building an airplanelike
  building an information system
• Enterprise Architecture is more like City
  Planning
• lots of buildings in a city
• lots of information systems in an enterprise

10
Enterprise Architecture includes

• Business (Process) Architecture
• Information (Data) Architecture
• Application Architecture
• Technology Architecture

11

• Enterprise Architecture is built with models as
  a house is built with stones
• - but a collection of models is no more an
  Enterprise Architecture than a heap of stones
  is a house.
• (with apologies to Poincare)

12
Architecture Dimension Model