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132 HENDERSON-SELLERS
Figure 8.2 The Five Top-Level Metaclasses of the OPEN Process Framework’s Metamodel

Stages

Provide macro- help to
organization to the Guideline

Essential
Process Producers
Components

Produce Produce

Create
Work Evaluate Work
units Iterate products
Maintain

are documented
using

Languages

Source: After Firesmith and Henderson-Sellers (2002). Copyright © 2002 Addison-Wesley.

in this way; alternatively, one of the existing AO methodologies (e.g., Prometheus or Tropos)
can be reconstructed by using only those specific AO fragments. For instance, Henderson-Sellers
(2005) shows in more detail how a version of the Prometheus methodology enhanced with some
Tropos concepts can be put together from the method fragments in this newly enhanced OPF
repository (Figure 8.4).
Overall, the strength of this SME approach is that the finally constructed methodology is highly
attuned to local conditions and the people in the organization. The challenge is to construct the
several deontic matrices, ensuring that (a) linkages accord to the local situation and (b) the inter-
faces of any pair of method fragments to be “plugged together” are compatible.