resent experiments that demonstrate that the threshold of the system depends on the size of the pumped volume. The transport of light in a scattering medium depends strongly on the length scales of the system. The relevant scales are the transport mean free path l, the distance after which the propagation direction of light is randomized, and the sample thickness L.IfL#l, the transport of light is not diffusive, and only single scattering may be important. 2,4 If L .. l, however, the propagation of light in the system cannot be explained without a role for multiple-scattering processes. The threshold of a laser depends on the balance between gain and loss of light in the system. The total amount of gain is the product of the amplification per unit path length and the path length traveled through the amplifying medium. 5 In a random laser the feedback (conventionally