Cultures which survive have the property of change.
Although some can only be preserved in toto within the
environment in which they arose, most can take bits
and pieces from other cultures and still retain their
identity.
This ability to change must always be kept in the
forefront when doing anthropological research.
When the research was done has to be part of the
analysis, as many cultures undergo changes within
a generation or two.
For example, stepping into a classroom in 1970 one
would encounter highly politicised students, many
actively engaged in the Anti-War Movement, Feminism,
Black Power, Civil Rights, etc.
Stepping into the same classroom in 2005 one encounters
a rather apathetic bunch, more akin to those of the
1950s, who attended college to gain the qualifications
for particular positions.
To attempt to use a monograph about University Students
written in 1970 to understand the 2005 student, would
ensure failure.
Hence, use that image when reading an ethnography done
twenty or more years ago.
The moment in time an ethnography reflects might be
obsolete. One will be studying a culture that no longer
exists, and find themselves making the most horrendous
errors.
Although many instructors tend to cling to the studies
they read as undergraduates, outside of a critical analysis
of the methodology, the document might be worthless.
Language changes. Words take up different meanings over
time. In Jamaica in 1980s, the City buses were called "Chi-
Chi" buses, because of the sound they made when stopping.
The term "chi-chi", in the late 90s, became a euphemism
for homosexuality.
A new editor, having spent the past fifteen years in
London wrote "Chi-Chi bus drivers strike," which caused
a near riot among drivers, and resulted in the Editor
having to be removed.
Consider everything you "know" about another culture
with suspicion. Be very careful in making assumptions.
You can glance at a previous ethnography, but don't use
it as a foundation.
Never forget, to survive change is vital, hence the culture
you are about to study has changed since that document was
published.
I find that although there is certainly a variety of cultural diversity, the difference in people across the globe is not that radical. People are pretty much people.