By breaking with the restrictive normative conception of contracts, wh
ich accords a special place to both the ''science'' of law and an econ
omic vision of the contract as a rational choice, the proposal is made
to interpret contractual practices in context. The example of a trans
national aluminum firm in Quebec serves to build a sociolegal typology
of five categories of contracts: legal, regulatory, normalized, commu
nitarian and moral. Lessons about the different forms of rationality (
legal, political, economic) underlying contracts are drawn from this e
mpirical typology.