In the field of social sciences, the notion of ''context'' is both one
of the vaguest notion and one of the more useful. Vague, because the
way contexts are framed and their theoretical status are often implici
t and ver), variable from one research to an other. Useful and central
, because social sciences are based on a contextual reasoning empirica
lly founded Interpretation in the field of social sciences assumes to
pass on from the abstract evocation or invocation of the ''social or h
istorical concert'' to the description of limited and relatively singu
lar contexts. In front of the various scientific uses of this notion,
searchers are tempted to separate the ''good'' definitions of context
from the ''bad'' ones, the ''relevant'' scales of context from the ''i
rrelevant'' ones. However, if we are conscious of the constructed scie
ntific nature of all ''social or historical contexts': we may discover
the specific knowledge effects adapted to each construction's mode of
contexts. Each scale of context squares with specific social complexi
ty order and the different authors of sociological or historical studi
es do not talk about the same social and historical reality. From one
research to another, the searcher may try to vary experimentally the a
perture of his lens, to combine different methodological languages, an
d may attempt each time to delimit the field of pertinence of his inte
rpretations depending on the choice of the point of view, the observat
ion's methods and the scale of context.