Linking Goal-Oriented Requirements and Model-Driven Development - Intentional Perspectives on Information Systems Engineering - page 260

Ta b l e 1 Guidelines for transformation of i ∗ models into OO-method class models

i ∗ construct Additional info Transformation guideline

Actor Class + Agent Link to the

Services generated from the
actor's internal tasks

Resource Physical entity Class

Informational entity related to a
resource or an actor

A Data Valued Attribute that
represents information of the
Class generated from an
actor or a resource

Informational entity in a
resource dependency

A Data Valued Attribute of the
Class generated from the
dependee actor

Task Involved in a resource

dependency

A Service of the Class
generated from the resource

If it generates a resource A Creation Service of the Class

generated from the resource

Dependency
link

Where the dependum resource
and the depender and
dependee actors are
transformed into classes

Associations are automatically
defined among the generated
Classes

metamodel obtained for the example, which is defined by considering the informa-
tion presented in Table 1. In this metamodel, the i ∗ constructs taken into account
are: actors , tasks , and resources .
The defined OO-Method requirement metamodel is considerably simpler than
the original i ∗ metamodel, which facilitates the implementation of model-to-
model transformations for generating the OO-Method class model. The additional
information introduced in this metamodel is the following:

• Specification of resource kind (attribute kind of the metaclass Resource ).

• Identification of tasks that generate resources (link producedBy ).

• Identification of tasks that participate in a resource dependency (links requiredBy

and providedBy ).

Fig. 7 The OO-method
requirement metamodel for
the example