  The paper presents the second part of a precise description of the prototype
that has been developed in the course of the ISAC project over the last two
decades. This part describes the "specify-phase", while the first part
describing the "solve-phase" is already published.
  In the specify-phase a student interactively constructs a formal
specification. The ISAC prototype implements formal specifications as
established in theoretical computer science, however, the input language for
the construction avoids requiring users to have knowledge of logic; this makes
the system useful for various engineering faculties (and also for high school).
  The paper discusses not only ISAC's design of the specify-phase in detail,
but also gives a brief introduction to implementation with the aim of
advertising the re-use of formal frameworks (inclusive respective front-ends)
with their generic tools for language definition and their rich pool of
software components for formal mathematics.
