Acknowledgements

This course was written by Hilary Holmes and Maria Townsend. It was updated by Cath Brown in 2022.

Except for third party materials and otherwise stated (see FAQs [Tip: hold Ctrl and click a link to open it in a new tab. (Hide tip)] ), this content is made available under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Licence.

The material acknowledged below and within the course is Proprietary and used under licence (not subject to Creative Commons Licence). Grateful acknowledgement is made to the following sources for permission to reproduce material in this free course:

Images

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Videos

Section 1.1: Produced by The Open University based on the following video produced by Khan Academy: https://www.youtube.com/ watch?v=52ZlXsFJULI

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