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Why do we use computers?
Image: 'Steve Nelson'http://www.flickr.com/photos/7171548@N04/2035853550Found on flickrcc.net
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Source: KS3 Computing POShttp://www.computingatschool.org.uk/data/uploads/secondary_national_curriculum_-_computing.pdf
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Source: CAS - Computing in the National Curriculum – A Guide for Secondary Teachershttp://www.computingatschool.org.uk/data/uploads/secondary_national_curriculum_-_computing.pdf
SOLO
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Prestructural “What’s binary?”
UnistructuralI can convert binary to denary.
I know that binary is ones and zeroes.
MultistructuralI can convert binary to denary & back again.
I can convert binary to ASCII.I know that binary is used to store data.
RelationalI understand how data is represented and stored on a
computer system.
Extended Abstract
I can see the big picture and start to understand/explain the reasons for using computers,
algorithms and file compression.
Lesson One
• Binary game – come up with a theory
• Binary dance off
• Paper exercises – converting one way and the other (overlearning)
• Appreciate the hard grind
• Homework – reinforcement.
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Lesson Two
• More paper conversions?
• What if there was a quicker way? A program?
• Why would this be better for us?
• Introduce computational thinking – post it decomposition exercise.
• On to Scratch – create our converter.
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Progress in Scratch coding Progress in debugging
Help Video
Pupils copy simple blocks from code provided.
Pupils can independently spot that there is something wrong with their code but couldn’t tell you
where in the code the problem is.
Pupils copy simple blocks from code provided and can explain in their own words what it
does.
Code blocks
Pupils are given the blocks they need and use trial and error to combine them to achieve a
specific purpose.Pupils can independently spot that
there is something wrong with their code and can identify the block or place where it is wrong but cannot fix it without help.
Pseudo code
Pupils add simple extra blocks to existing code to modify the blocks effect. (eg Looks & Sound
Blocks)
Pupils reuse blocks of code that they learnt in class within their own similar program. Pupils can independently spot that
there is something wrong with their code and can fix it
Extra Challenges
Pupils combine reused blocks with blocks of their own devising (most programming is like
this).@MrAColley www.mrcolley.com
ASCII
• Secret messages
• Data representation
• Can build into networks
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