Designing the Moment
Robert Hoekman Jr's sequel to Designing the Obvious, Designing the Moment presents more insight into the steps that Hoekman uses to evolve designs from something difficult and obtuse to something that is foolproof (Poke yoke) and a pleasure to use.
The examples used are different to Designing the Obvious, and the justification is different. In this case creating a consistent sense of the application being pleasurable to use complementing his previous observations about obvious systems being more productive and making more money.