I am looking for an observational, not a self-report, measure of group functioning (e.g., trust, cohesiveness, motivation) that would be appropriate for work with collectivist cultures (Latino immigrants).
The classic approach to making observational measures of group functioning is Robert Bales' Interaction Process Analysis (1950), later modified and called Systematic Multiple Level Observation of Groups (SYMLOG).
If you just Google "Bales IPA" you'll find lots of very usable information. It works very well, especially if you have multiple observers.