Last week we discussed “seven hats” so why are we discussing “eight hats” this week. As our concepts and theories evolve, we adapt our assessments to fit the new model. Kirk’s (2012) “eight hats of data visualization design” was influenced by Edward de Bono’s six thinking hats. However, last week we discussed “seven hats.” What changed from Kirk’s 2012 book to his 2016 book? This week we will discuss the similarities and differences of Kirk’s (2012, 2016) hats