place a teabag in a mug

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(No Transcript)
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• place a teabag in a mug
• boil some water
• pour over teabag
• wait until strong enough
• remove the teabag
• add some milk and stir.

what is this?
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• procedure maketea
• objects mug, teabag, water, milk
• actions pour, put, boil, stir, drink
• conditions strong, cool
• begin
• boil water
• put (teabag, mug)
• pour (water, mug)
• repeat until strong TRUE
• put (teabag, NOT mug)
• pour (milk, mug)
• stir (mug)
• repeat until cool TRUE
• end
• end procedure

what is this?
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• what is this?

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Algorithm is a metaphor Imagine making a cup of
tea When pupils are first introduced to
programming at whatever level, a popular example
is making a cup of tea. It is an activity
associated with combining components in a
specific order, over a period of time and ends
when a condition is set.
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The format of instruction could be considered to
be a metaphor if it is a whole set of
alternative labels, a whole apparatus of
organisation that takes over new territory
(Goodman, 1951)
Goodman, N (1951) The Structure of Appearance
Harvard University Press
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John WoollardSeptember 2003