Different methods require different amounts of time and money and this may influence the sociologists choice.
The researcher’s access to resources can be a major factor in determining which methods they employ.
Requirements of funding bodies
Research institutes,businesses, and other organisations that provide the funding for research may require the results to be in a particular form.
Sociologists have to use a method capable of producing such data, e.g. questionnaires or structured interviews.
Personal skills and characteristics
Each sociologist possesses different personal skills and this may effect their ability to use different methods.
Not all sociologists have these qualities as some may have difficulty using these methods.
Subject matter
It may be much harder to study a particular group or subject by one method than another.
Research opportunity
Sometimes the opportunity to carry out research occurs unexpectedly. This means it may not be possible to use structured methods, e.g. questionnaires, which take longer to prepare.
Other circumstances, the researcher might have been able to set up the research opportunity carefully beforehand and have plenty of time to select their methods.
JamesPatrick (1973) - chance to spend time with his gang - had to use participant observation.