Bottling beer (or soda-pop) from a keg can be tricky. The problem that you will face is that once beer (or champagne, or mead) is carbonated, as it is pushed through a dispensing line into a bottle, it tends to foam and produce a head (and de-gas, losing carbonation).
Data users have a responsibility to pay cost recovery payments to data custodians, where applicable.  Data users and data custodians are responsible for ensuring that datasets are used for the approved purposes only. This is facilitated by practices which help avoid the misinterpretation of data.
The second role to play is the observer role. The observer encourages the user to âthink aloudâ and takes notes (uses an observation protocol, see table 1) of what is happening. The aim of the observer role in this exercise is to gain experience from acting as an observer. The third role is that of a meta-observer.e are not focusing on the user role and userâs relation with the observer. Of course, the main role when gathering data from user interaction is the observer role. The role of the meta-observer should be perceived as a means to further learn observation.