1 Compare the advantages and disadvantages of the survey to those of observation. Under which circumstances could you make a case for using observation? 2 What ethical risks are involved in observation? In the use of unobtrusive measures? 3 Based on present or past work experience suggest problems that could be resolved by using observation-based data. 4 Distinguish between the following: a The relative value of communication and observation. b Nonverbal linguistic and extra linguistic analysis. c Factual and inferential observation.