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Defining Programming Standards |
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CHAPTER 2 : Psychological Factors
2.5 Cues and ContextThe brain is also good at guessing patterns, especially given the start of a known pattern. The moment that a pattern starts, the brain immediately takes this as a cue. It starts trying to predict the rest of the pattern by fitting all known continuations to the given start-piece of pattern. Thus if you read the following sentence, one word at a time:
"As I lead him by the nose, he believes every word I tell him."
From the very beginning, "As I", you have pictures of yourself, or a previously described first party. "lead" has two pronunciation and meanings - it appears to be a present-tense verb here (although the metal 'lead' could associate with the past tense 'led' and cause confusion); "him" makes a male, but is he human? a dog?; "by the nose" gives images of bulls; "as he believes" makes "him" human (bulls aren't that clever); "every word I tell him" shows the early part of the sentence to be a figure of speech and makes the whole sentence intelligible. By using clear sentences and structure, we can avoid ambiguities and confusion from the first part of the sentence to the end. For example, a very simple rearrangement of the above sentence may make understanding a little easier:
"He believes every word I tell him, as I lead him by the nose."
This sentence by itself is not very informative, as the rest of the story is not present. It is the greater context which gives sense to the individual words and sentences. Understanding is a function of both words and context. Similarly, when reading a program, there must be sufficient surrounding information to be able to make sense of the individual lines of code, functions and modules. This informations must also be clear, avoiding ambiguous words and phrases.
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