Here we will discuss Human Interfaces Guidelines for Plasma Mobile's apps.
This thread focus the HIG in common between all main apps for Plasma Mobile. More app-specific design guidelines will be discussed in dedicated threads (i.e. file manager guidelines, gallery guidelines etc)

Please, notice that the Plasma Mobile have 4 main topics:

1) Plasma UI/UX
2) Plasma default config
3) Apps HIGs (this thread)
4) Other ideas