My ergonomic information is based on over 40 years of study. If you are right-handed and you are doing the dishes, the dish is always in your left hand and you scrape into the disposal with your right hand. If the drain is on the left, the drain will be behind your dish. Right-handed, right drain. Dishwasher location: Right handed, it goes on the left. When a right-handed person already has the dish in their left hand, the dishwasher is already on the left! Saves some movement or switching hands. The dishwasher location is not so ergonomically critical. When designing the kitchen, look at the floor plan with the dishwasher door OPEN. If it impeeds traffic from the eating area where people would have to walk around the door to rinse dishes, put it on the other side. Having a drain on the wrong side can be VERY annoying to many people. I had a lady insist on a left drain even after I told her the above information. 3 months later she called and said she could not take it anymore and ordered ANOTHER sink with a right drain. I asked what she was doing with the original sink, she said she would likely sell it, but even if she didn't it was worth getting a right drain and she admitted she should have heeded my warnings.
Q