Abstract: A system and an apparatus and method for detecting and discriminating articles that are within a predetermined range of a specification into lots. A counting head assembly includes at least an article detecting unit located above diverting gates which control the passage and/or accumulation of articles in adjacent channels to permit filling of article containers with predetermined article portions as containers are placed beneath, and removed from, the assembly outlet. A plurality of such assemblies may be combined to provide high speed continuous container filling operations, for example by location of a plurality of counting head assemblies about the periphery of a rotating carousel or on a linear platform which moves containers beneath the assemblies for simultaneous filling of groups of containers.