I agree with Griffen and John completely. SES is a problematic and limited measure for a person's greater status in society. Often, SES measures are dependent only on income or education level but as John says using these measures ignores other factors such as size of the household a person may be supporting or access to social connections. When applied to research, we may be incorrectly concluding that what we call socioeconomic status does not have an effect if we only measure specific aspects of it. I agree with Griffen that we should be examining what specifically is measured in "SES" when evaluating literature before taking the findings to heart.