When the engineering staff begin planning a designed experiment, they should ________?
1) wait until the details of the design of the experiment are firmly in place before involving process technicians
2) include process technicians in the discussion about how far the unit can be pushed in all directions
3) exclude process technicians so that the experiment will be done purely from an objective scientific viewpoint
4) include process technicians prior to designing the experiment but not in any of the discussions during the design itself