Computational Thinking by Peter Denning & Matti Tedre

Author:Peter Denning & Matti Tedre [Denning, Peter & Tedre, Matti]
Language: eng
Format: epub
Tags: computational thinking; computational models; computing machines; computer science; software engineering; design; designing for humans; computational science; teaching computational science; future computation
Publisher: MIT Press
Published: 2019-04-12T00:00:00+00:00

Hints

Butler Lampson, a superb and accomplished designer, summarized a number of guidelines for advanced designers of operating systems.9 He said: “Designing a computer system is very different from designing an algorithm. The external interface is less precisely defined, more complex, and more subject to change. The system has much more internal structure and hence many internal interfaces. And the measure of success is unclear.” He said the less skilled designers often flounder in seas of possibilities, not knowing how a current choice will affect future choices of the performance of the system. He called his statements “design hints” because they are judgments skilled designers learn to make over time; they emphasize the considerable art in designing. In table 5.2 we list Lampson’s hints for three dimensions of system development (rows) and major aspects of the DRUSS objectives (columns). Though they may appear as generalities, they are quite meaningful in shaping the CT skills of advanced designers.

Table 5.2 Lampson’s Design Hints

Correctness & Fit Speed Fault Tolerance

Use cases

Separate normal and worst cases

Safety first

Shed load

End-to-end

End-to-end

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