The core flow slicing algorithm is based on the sample and hold algorithm [11]. After presenting the core algorithm, we discuss four extensions: adding packet sampling to scale to high speed links, using an inactivity timeout to reduce memory usage at a router, adding binned measurement to reduce binning error during analysis, and adding multi-factor smart sampling to control the volume of flow data reported. The version of Flow Slices described used for has the first two extensions. We also discuss the configuration parameters of Flow Slices, and how they can be set adaptively based on the current traffic mix.