Taken from the Nestle careers site, this is about when they were designing the KK Chunky:
"... we
finally whittled it down to two favourites - a chunky twin-fingered bar
and a single finger bar - each covered with thick chocolate. Both
performed well in early focus group research, but we finally decided
that the single-finger route was the way to go because it wouldn't
impact so directly on the market share of the traditional Kit Kat. It's
worth noting that a number of different disciplines had a hand in the
final choice, from sales and marketing to finance and manufacturing
management".
