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This paper presents PROGRESSIVE, a topology discovery and multihop scheduling protocol that progressively collect network connectivity information and schedules nodes which have an identified routing path(s) to the sink. PROGRESSIVE saves energy by limiting the time during which CSMA is used for control message transmissions. In addition, it achieves full network scheduling in a short period of time hence, PROGRESSIVE is an efficient protocol for mission critical applications that require real time scheduling setup phase. The performance of PROGRESSIVE is compared to DRAND based on simulations in ns-2.