Q.: Two operators did the chiseling to expose the aggregate on some areas of architectural concrete that we wanted to expose. It's pretty clear which operator worked on any particular area. How can we get uniform work when we need more than one operator?

A.: Any two operators are likely to produce differences in appearance because of differences in technique. This is particularly noticeable if you have a left-handed and a right-handed operator. One method is to put them to work on separate walls, or sections that are not adjacent. Another is to plan the work to deliberately work the differences into a pattern.