We introduce MV-observables, an analogue of observables for
MV-al\-geb\-ras, as  $\sigma$-homo\-morphisms from the Borel tribe
generated by the Borel sets of $\Bbb R$ and constant functions from
$[0,1]$ into an MV-algebra $M$. We show that it is possible to
define such observables  only for weakly divisible MV-algebras. We
present a representation as well as a so-called calculus of
MV-observables, which enables us to construct e.g., sum .or product
of MV-observables.
