This paper deals with the sequential diagnosis approach
and the associated test sequencing problem (i.e., the problem of
generating the sequence of tests required to reach a diagnostic
conclusion at minimum cost). The traditional test sequencing problem
is generalized here to include asymmetrical and multivalued tests.
We present the Sequential Diagnosis Tool
(SDT) that enables the user to generate solutions
of the generalized test sequencing problem.
SDT can be employed as a kernel of a diagnostic reasoner in automatic
test equipment or system maintenance software.