What's it all about?
See teaching this in action
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
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.
Read the full unit plan description