* https://cdns3.trainingindustry.com/media/2624955/knowledgepool-they%20think%20it’s%20all%20over.pdf
** http://www.willatworklearning.com/2010/12/how-much-do-people-forget.html
*** https://cdns3.trainingindustry.com/media/2624955/knowledgepool-they%20think%20it’s%20all%20over.pdf
**** http://www.willatworklearning.com/2010/12/how-much-do-people-forget.html