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In 1975, FredBrooks said:
I will contend that Conceptual Integrity is the most important consideration in system design. It is better to have a system omit certain anomalous features and improvements, but to reflect one set of design ideas, than to have one that contains many good but independent and uncoordinated ideas.
In 1995, Brooks still hasn't changed his mind:
I am more convinced than ever. Conceptual Integrity is central to product quality. Having a system architect is the most important single step toward conceptual integrity...after teaching a software engineering laboratory more than 20 times, I came to insist that student teams as small as four people choose a manager, and a separate architect.
According to Fred Brooks, "Conceptual integrity in turn dictates that the design must proceed from one mind, or from a very small number of agreeing resonant minds". To me, a very small number would only mean the entire team only when that team is a very small number. In my opinion,Conceptual Integrity is a required ingredient for achieving the principle (I think espoused by Alan Kay ?) that "a system must have a powerful metaphor that is uniformly applied throughout a system".
Conceptual Integrity does not mean one shouldn't include many minds (or even the entire team for that matter) in the Analysis & Design process. This is a very important detail that shouldn't be discounted by those who wish to do away with the role of architect. Team input in Analysis and Design is absolutely essential for (1) establishing Team, (2) ensuring the soundness and quality of the analysis, and (3) refactoring the design into something more polished.
In fact, the earlier the architect or design-team can include the entire team (or domain-team leads for very large teams), the higher quality the design will be.
However, if there is no final word, no one-mind fighting off the democratic compromises that can reduce a vision to its lowest common denominator, then it will be difficult to achieve Conceptual Integrity and the system may run the risk of becoming an Amorphous Blob Of Human Insensitivity (due to Too Many Cooks In The Kitchen?). It is important to realize that you can be inclusive (or team-oriented) without being everyone-designs or anti-architect. Said another way, it is possible to have an architect and have team collaboration on a design at the same time.It is also important to note that on a small team, the design-team may in fact be the whole product team. Another approach would have the architect role and the coach or technical/team lead role (i.e. the final say or tie-breaker) be filled by a single individual in order to ensure Conceptual Integrity. As is mentioned in much of the RationalUnifiedProcess literature, there is no requirement for a 1 to 1 or even a 1 to N cardinality between roles and people. A single person could hold many roles just as a single role could be held by many people.
Can we identify specific, well-known examples of Conceptual Integrity?
We can consider conceptual integrity as one of the components of Architectural Quality, component that minimize of design complexity.
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