Question:
I have four identical oranges. How many ways are there for me to divide these oranges into at most three groups?  (By definition, a group must have at least one orange.)

Answer:
All the oranges can go in one group, or $3$ can go in one group and $1$ in another group, or $2$ can go in one group and $2$ in another group, or $2$ can go in one group and each of the other $2$ can be in a group by itself.

As a list, we have: \begin{align*}
&4 \\
&3,1\\
&2,2\\
&2,1,1.
\end{align*} This gives a total of $\boxed{4}$ possibilities.