Lots of debates on breadth versus depth – but both are necessary….

http://www.fastcompany.com/52795/strategy-design
http://www.fastcompany.com/tag/bruce-mau
http://www.fastcompany.com/tag/nike-plus
http://www.fastcompany.com/55581/business-design
and
http://darrennegraeff.com/the-importance-of-t-shaped-individuals/
http://rossdawsonblog.com/weblog/archives/2013/03/building-future-success-t-shaped-pi-shaped-and-comb-shaped-skills.html
http://www.sciencedirect.com/science/article/pii/S0048733313001881
http://blogs.edweek.org/edweek/learning_deeply/2015/07/breadth_and_depth_can_we_have_it_both_ways.html
http://www.itbriefcase.net/fitting-to-the-t
http://www.prconversations.com/2014/04/a-chicken-and-egg-conundrum-for-pr-careers/