Hybrid software processes are defined as a combination of practices from
traditional and agile methodologies. Most software development companies
currently apply this kind of process; however, the appropriate combination of
practices is not often clear. To address this issue, we have proposed DynaTail
in a previous study, i.e., a method for tailoring a software process and its
practices to a particular context to improve a certain characteristic. In this
work, we use an MDE approach to formalize all the artifacts involved in
DynaTail: processes, context, practices influencing goals, and tailoring
transformations. This model-based formalization lays the base for building
supporting tools. We illustrate all models with a running example from a
Chilean medium-size software development company.