Process Choreography Design in choregraphies:

The design of process choreographies involves a series of activities. In each
of these activities, artefacts are developed. These activities are described as
follows:
1. High-level Structure Design: In high-level choreography design, the participant
roles as well as their communication structures are identified. High

level structure design is conducted during the Participant identification
phase.
2. High-level Behavioural Design: High-level behavioural models specify the
milestones of the collaboration and the order in which the milestones
are reached. High-level behavioural design is done during the milestone
definition phase.
3. Collaboration Scenarios: High-level choreographies are refined by introducing
dedicated collaboration scenarios that relate the reaching of milestones
to the communication between process participants. Collaboration
scenarios are developed during the choreography definition phase, based
on the scenarios informally specified during scenario modelling.
4. Behavioural Interfaces: From these collaboration scenarios, for each participant
role, a behavioural interface is derived.
High-Level Design
High-level process choreography design involves structure design and behaviour
design. In high-level structure design, participant roles of the choreography
are defined, as part of the participant identification phase. Figure 5.5
shows a high-level structure diagram for participants involved in a bidding
scenario. This diagram identifies a seller, an auctioning service, and multiple
bidders as participants. It also shows that these participants are pairwise interconnected.
Therefore, any participant can interact directly with any other.
High-level behaviour design uses milestones that are achieved during the
collaboration; it is therefore part of the milestone definition phase. Each milestone
represents a state in the overall collaboration that has a business meaning,
represented by some business value. Milestones correspond to subgoals
reached during the collaboration on the way to reaching its ultimate goal.
For instance, the ultimate goal in the bidding scenario is that the offered
goods are sold, paid for, and delivered to the bidder with the highest bid. Several
intermediate steps can be distinguished: the initial setup of the auction,
the entry of potential bidders into the auction, the actual bidding process,
and the delivery and payment.