A Green Belt has approached you for advice. Her team are concerned over the amount of variance it takes to respond to clients billing queries. The team are not sure what the cause is$,$ some people think it is because they can never find the necessary information without searching, others say that it is because they keep on making the same simple mistakes repeatedly. There are several vocal advocates who believe it is because the amount of "paperwork" needed at the end of a query is slowing things down. The team want to do something about this but are unsure how to proceed.

Which one of the following would you recommend for the team to attempt first?

Select one:

a$.$ SMED

b$.3$Cs

c$.$ Poka Yoke

d$.5$S

e$.$ DFSS