Unit plan: Error detection and correction

What's it all about?

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The world is a complicated and imperfect place, and errors can occur whenever information is stored or transmitted. Data stored on hard disks, DVDs and flash memory can be changed if there is a tiny fault in the device (and these occur regularly!). Information received over networks can be corrupted if there's interference on the line or a faulty component in the system. Even scanning information from barcodes and QR codes is a form of information transmission, and small errors such as dirt or scratches on the code can change the information. Yet we rely on data so much that there could be serious implications from even a single digit error in a student's grade, or a small change to a payment, or an incorrect reading in a medical scan. Error detection techniques add extra information to data to determine when errors have occurred. The …

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Ages 5 to 7 Programming challenges
In the teacher observations sections there may also be background notes on the big picture. There is no expectation that 5 to 7 year olds will need to know this, but if you are asked, you have the answer at your fingertips.
1 Parity magic No
Ages 8 to 10 Programming challenges
1 Parity magic Yes
2 Product code check digits Yes