Conceptual Integrity has been claimed to be the essence of high-quality software system design. On the other hand, it has been a rather elusive attribute of software systems, challenging various attempts of a clear-cut characterization. This paper evolves in this direction by two means: first, by analysis and clarification of open issues in architecture and abstraction terms; second, by pointin...

Building software systems is hard; evolving them is harder. Even with complete requirements, architecture and design documentation, comprehending a system, or even a part of a system, in such a way as to understand the implications of the changes we make is a difficult task. I believe that the separation of architecture from design helps us with the problem of system comprehension: identifying ...

During a historic prospective study, measurements of weight, height and head circumferences were carried out in a group of 393 Tehrani boys and girls between the first and 36th month of life and measurements were plotted over the N.C.H.S. curves. These children belonged to middle and high-class literate families who were able to understand and follow the medical advice given by their privat...