One thing that I've noticed during my observation and now having 1 yr experience as a tech (and having observers come into the clinic) is that asking questions can be beneficial, but searching for questions to ask just to ask them is not something I recommend. Don't think that because you're observing you're obligated to ask questions all the time. Don't force the questions to the PTs, some will know that you're forcing them. Don't be afraid to ask them questions even if they look busy all the time. Be confident in asking them. Sometimes you have to pick their brains here and there. Some PTs that I've observed and now work for tend to huddle around their own space, but they don't really mind questions here and there. Especially when you're trying to figure out something about the patients you're treating. It's better to ask and do instead of just assuming and doing. Just be yourself, be relaxed, you are there to learn and observe. And who knows, you may get opportunities here and there to help out the techs and/or PTs there. I went into an acute care hospital thinking I was just going to observe, but the PT there was so friendly and included me in the therapeutic exercise sessions.