Observational research involves directly observing and recording behaviors and perspectives of participants in their natural environment. It is commonly used alongside other qualitative methods like interviews and focus groups. Pros of observational research include its flexibility, ability to directly measure behaviors, and provide an insider perspective, while cons include it being time-consuming, difficult to record everything, and potentially invasive or intrusive. Key aspects of observational research include developing relationships with participants, refining the study design based on initial observations, selecting additional participants, following up with participants, and considering ethical issues around disclosure and consent.