"Beyond Tellerrand: The Icon Design Process"
There is a few steps to follow to design an icon. John Hicks presented his workflow and the things you better have to be aware of when designing.
Here is my sketchnote:

You can grab the slides on Jon Hicks’s website.
And some pictures of the talk:

Jon Hicks – The Icon Design Process – beyond tellerrand Berlin 2014 from beyond tellerrand on Vimeo.
Tweets
Some tweets related to the talk:
Didn’t know @hicksdesign did Skype emoticons. Have to find him after the talk to thank him for the joy those brought to my daughter. #btconf
— Bastian Albers (@bastianalbers) 5 Novembre 2014