Nonbehavioral Observation Method you would use AND a Behavioral Observation Method

You are a manager at a restaurant and are concerned with the customer service skills of your waitresses. In some cases, you feel the waitresses spends too much time at the customer's table, and you also have concerns that the waitresses are not selling enough beverages like wine, mixed drinks and soft drinks. Afterall, this is where your restaurant makes most of its profits...from the beverages sold. You want to set up an Observational Study. Provide an example of the kind of Nonbehavioral Observation Method you would use AND a Behavioral Observation Method. That is describe for me: a) Anonbehavioral observation approachthat you might use and what information you think you get from it and b) Abehavioral observation approachthat you might use and what information you think you get from it.

Can you help me to answer this.