This slide deck discusses reusability, a topic that is sort of a "holy grail" in software architecture. Unfortunately, reusability often is discussed in the wrong places and for the wrong reasons, especially if it is used to sell a new architectural paradigm ("via reuse, the initial investment will amortize very soon and it will pay for itself").
I start with the origins of the topic in the early 1970s (and the different conditions how software was developed back then). Then I discuss and debunk the most widespread fallacies that are typically used to press for reusability.
With that knowledge I present a few advices (not dogmas!) how to deal better with reusability - when not to use it, what to do instead of those places, and: When to use it!
Reusability has a huge value in software development and we need to make sure to harvest it. But pressing for it in the wrong places for the wrong reasons only causes problems and harm. We need to avoid that and the intention of the talk is to have better arguments if you encounter such a situation.
This is the unabridged slide deck containing all slides of the talk. For conferences, I usually leave out several slides to meet the session length constraints.
I also accompanied this slide deck with a blog series that can be found at https://ufried.com/blog/reusability_fallacy_1/. The series consists of 4 posts, covers the contents of this talk and provides a few more ideas and pointers.