Copyright notice

Except for third party materials and/or otherwise stated (see terms and conditions http://www.open.ac.uk/conditions) the content in OpenLearn and OpenLearn Works is released for use under the terms of the Creative Commons Attribution-NonCommercial-Sharealike 4.0 licence http://creativecommons.org/licenses/by-nc-sa/4.0/
In short this allows you to use the content throughout the world without payment for non-commercial purposes in accordance with the Creative Commons non commercial sharealike licence. Please read this licence in full along with OpenLearn and OpenLearn Works terms and conditions before making use of the content.
When using the content you must attribute us (The Open University) (the OU) and any identified author in accordance with the terms of the Creative Commons Licence.
The Acknowledgements section is used to list, amongst other things, third party (Proprietary), licensed content which is not subject to Creative Commons licensing. Proprietary content must be used (retained) intact and in context to the content at all times. The Acknowledgements section is also used to bring to your attention any other Special Restrictions which may apply to the content. For example there may be times when the Creative Commons Non-Commercial Sharealike licence does not apply to any of the content even if owned by us (the OU). In these stances, unless stated otherwise, the content may be used for personal and non-commercial use. We have also identified as Proprietary other material included in the content which is not subject to Creative Commons Licence. These are: OU logos, trading names and may extend to certain photographic and video images and sound recordings and any other material as may be brought to your attention
Unauthorised use of any of the content may constitute a breach of the terms and conditions and/or intellectual property laws.
We reserve the right to alter, amend or bring to an end any terms and conditions provided here without notice
All rights falling outside the terms of the Creative Commons licence are retained or controlled by The Open University.

Head of Intellectual Property, The Open University
The Open University
Walton Hall, Milton Keynes
MK7 6AA

Except for third party materials and/or otherwise stated (see terms and conditions [http://www.open.ac.uk/conditions]) the content in OpenLearn is released for use under the terms of the Creative Commons Attribution-NonCommercial-Sharealike 2.0 licence [http://creativecommons.org/licenses/by-nc-sa/2.0/uk/].In short this allows you to use the content throughout the world without payment for non-commercial purposes in accordance with the Creative Commons non commercial sharealike licence. Please read this licence in full along with OpenLearn terms and conditions before making use of the content.When using the content you must attribute us (The Open University) (the OU) and any identified author in accordance with the terms of the Creative Commons Licence.The Acknowledgements section is used to list, amongst other things, third party (Proprietary), licensed content which is not subject to Creative Commons licensing. Proprietary content must be used (retained) intact and in context to the content at all times. The Acknowledgements section is also used to bring to your attention any other Special Restrictions which may apply to the content. For example there may be times when the Creative Commons Non-Commercial Sharealike licence does not apply to any of the content even if owned by us (the OU). In these stances, unless stated otherwise, the content may be used for personal and non-commercial use. We have also identified as Proprietary other material included in the content which is not subject to Creative Commons Licence. These are: OU logos, trading names and may extend to certain photographic and video images and sound recordings and any other material as may be brought to your attention.Unauthorised use of any of the content may constitute a breach of the terms and conditions and/or intellectual property laws.We reserve the right to alter, amend or bring to an end any terms and conditions provided here without notice.All rights falling outside the terms of the Creative Commons licence are retained or controlled by The Open University.Head of Intellectual Property, The Open University

1.0

About this content:
This content is taken from an Open University module, which was originally published as an open educational resource on the OpenLearn website http://www.open.edu/openlearn. This content may include video, images and interactive content that may not be optimised for your device. To view the original version of this content please go to OpenLearn - Defnyddio gwaith gwirfoddol i gamu ymlaen yn y farchnad swyddi

If reading this text has inspired you to learn more, you may be interested in joining the millions of people who discover our free learning resources and qualifications by visiting The Open University http://www.open.ac.uk/choose/ou/open-content

Terms of Use:
As stated in our copyright you are free to use the content throughout the world without payment for non-commercial purposes in accordance with the Creative Commons Attribution-NonCommercial-Sharealike 4.0 licence http://creativecommons.org/licenses/by-nc-sa/4.0/

To find out how to reuse our content we have short free course on how to remix and reuse open content.

Track OER
Track OER is designed to help find out about where OER is being used. The benefit of this is so that we can continue to gather the information that is needed to improve OER and help exploit the openness of OER. By tracking it also will assist with enhancing brand awareness due to the value of providing OER, as the ability to track where the OER is used potentially will provide valuable information about who and where our OER content is being used.

Track OER is software that tracks Open Educational Resources, gathering data on HTML packaged content that is downloaded from OpenLearn and OpenLearn Works.
The Track OER code is found at the bottom of every HTML file within the zipped package. To remove the Track OER code, delete the lines in each file beginning with the comment .