I thought you might find the following links useful if you're researching Organisational Development - either because you want to or because one of your assessments requires you to!
Here they are:
CIPD Profession Map (last accessed 18 February 2014) http://www.cipd.co.uk/cipd-hr-profession/profession-map/ - Quite useful when talking about the relationship between Organisational Development and HR and HRD
CIPD Fact Sheet on Organisational Development (Revised November 2012, last accessed 18 February 2014) http://www.cipd.co.uk/hr-resources/factsheets/organisation-development.aspx#link_0 - Some useful definitions of Organisational Development along with some research and CIPD commentary on the subject.
Organization Development Strategies and Models (Beckhard, 1969, Organization Development Network (http://www.odnetwork.org/ last accessed 18 February 2014) - The Organisational Development Network, must contain some useful content on the subject of OD.
The Kirkpatrick Methodology (Kirkpatrick Partners, http://www.kirkpatrickpartners.com/OurPhilosophy/tabid/66/Default.aspx last accessed 18 February 2014) - useful when talking about how best to measure the impacts of OD activity. After all the Kirkpatrick model can be appropriately used for this.
Hope that helps