  Let $\mathcal C$ be a $\mathcal V$-enriched model category. We say that an
object $x$ of $\mathcal C$ is homotopy tiny if the total right derived functor
of $\mathcal C(x, -) : \mathcal{C} \rightarrow {\mathcal V}$ preserves homotopy
weighted colimits. Let $\mathcal C_0$ be a full subcategory of $\mathcal C$ all
of whose objects are homotopy tiny. Our main result says that the homotopy
category of the category generated by $\mathcal C_0$ under weak equivalences
and homotopy weighted colimits is equivalent to the homotopy category of the
category $\mathcal V^{\mathcal C_0^{op}}$ of $\mathcal V$-enriched presheaves
on $\mathcal C_0$ with values in $\mathcal V$. If $\mathcal C$ is generated by
$\mathcal C_0$, then $\mathcal C$ is Quillen equivalent to $\mathcal
V^{\mathcal C_0^{op}}$. Two special cases of our theorem are Schwede-Shipley's
theorem on stable model categories and Elmendorf's theorem on equivariant
spaces.
