Cross-functional
Each Developer is expected to work collaboratively with other Developers to deliver the Sprint Goal, rather than work only in their capability silos and only do work that directly reflects their capability area.
Rather than say “I’m a part of the test team”, a Developer with test capability would say “I’m part of the Scrum Team”.
Don’t overload the work in-progress
Developers are expected to help get work to Done before they take on new work into the Sprint.
The temptation is when, for example, software development tasks are done, to then start on new work before other work has reached Done. Developers are expected to work to the mantra “start finishing and stop starting”.