II. Sampling Procedures
Twenty students of fourth year were randomly selected from students units to represent the total number of all. Random sampling was claimed to be the best method in selecting samples because all population of the target group had an equal chance to be selected (Pleansaisurb. 1984: 30).
III. Questionnaire
An English – Thai questionnaire constructed to study English speaking skill of nurses at Rajavithi Hospital consisted of five parts.