Episode 53: Product Line Engineering Pt. 1

Variability

Variability is a cornerstone of software product line engineering, encompassing both feature models and implementation. Michael Kircher explains that variability is present in both the feature model and the implementation, linking the solution space with the problem space 1. This connection is crucial for managing variation points in source code and models. Markus Voelter adds that feature models act as a grammar, guiding the selection of feature combinations to ensure a functional product 2.

A feature model helps you come up with a correct configuration of features that will result in a workable and useful product.

--- Markus Voelter

Understanding the binding time of variability is essential, as it influences whether changes can be made at runtime or need to be decided earlier 1.

   

Configuration

Configuration techniques in product line engineering range from minimalist to maximalist approaches. Markus Voelter describes the minimalist approach as adding application-specific elements, while the maximalist approach involves removing unnecessary components 3. This choice often depends on non-functional requirements, such as memory constraints in embedded systems.

If you have to keep a number of those different products valid over a long time, then product line engineering is especially interesting.

--- Markus Voelter

Modeling languages also play a role, with configurations ranging from simple boolean selections to complex frameworks 4.