Some programs are as small as essays. Others are like sets of encyclopedias. Writing good essays and books requires careful planning, and writing good programs does, too. Small or large, a good program cannot be created by tinkering around. It must be carefully designed. Each piece needs a lot of attention; composing programs into larger units must follow a well-planned strategy. Designing programs properly must be practiced from our very first day of programming.
Read the whole page (and the whole book) at http://www.htdp.org/2003-09-26/Book/curriculum-Z-H-4.html
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