Regarding first impressions, I agree that explaining the course and my expectations the frist day are a critical part of managing the class/lab. The students need to know there are rules that must be followed in the kitchen-how to safely walk with a knife in the kitchen for example. Even handwashing needs to be emphaized as they may becaome distracted with a time or temperature issue. It is important they understand how the grading system (Rubrics) works. And they need to know they have responsiblities: cleaning, homework, being respectful and professional as well as being on time. The fewer surprises the better the chances are for learning and productivity.