  This talk focuses on a recent work aiming at determining the composition of
certain $N^*$ and $\Delta$ resonances, i.e. whether they are compact states
formed directly by quarks and gluons, or composite generated from the
meson-baryon interaction. The information of the resonance poles is provided by
a comprehensive coupled-channel approach, the J\"ulich-Bonn model. Thirteen
states that are significant in this approach are studied. Two criteria for each
state are adopted in this paper, the comparison thereof roughly indicates the
model uncertainties. It is found that the conclusions for eight resonances are
relatively certain: $N(1535) \frac{1}{2}^-$, $N(1440) \frac{1}{2}^+$, $N(1710)
\frac{1}{2}^+$, and $N(1520) \frac{3}{2}^-$ tend to be composite; whereas
$N(1650) \frac{1}{2}^-$, $N(1900) \frac{3}{2}^+$, $N(1680) \frac{5}{2}^+$, and
$\Delta(1600) \frac{3}{2}^+$ tend to be compact.
