  The terminology of sourcing, outsourcing and insourcing is developed in
detail on the basis of the preliminary definitions of outsourcing and
insourcing and related activities and competences as given in our three
previous papers on business mereology, on the concept of a sourcement, and on
outsourcing competence respectively.
  Besides providing more a detailed semantic analysis we will introduce,
explain, and illustrate a number of additional concepts including: principal
unit of a sourcement, theme of a sourcement, current sourcement, (un)stable
sourcement, and sourcement transformation.
  A three level terminology is designed: (i) factual level: operational facts
that hold for sourcements including histories thereof, (ii) business level:
roles and objectives of various parts of the factual level description, thus
explaining each partner's business process and business objectives, (iii)
contract level: specification of intended facts and intended business models as
found at the business level. Orthogonal to these three conceptual levels, are
four temporal aspects: history, now (actuality), transformation, and
transition.
  A detailed description of the well-known range of sourcement transformations
is given.
