This paper provides a specifying coordination based analysis of Heavy NP Shift (HNPS) in English. Proposing that the clause involving HNPS has bi-clausal VP or TP coordination, we submit that HNPS is derived by leftward movement of one surviving phrase from the second clause to deleted. We then show that the well-known restrictions on HNPS like the Right Roof constraint or the ban on preposition-stranding HNPS follow this conception of HNPS. Specifically. the Right Roof constraint is attributed to the economy requirement of sentence structure building in English which employs left-branching. The ban on preposition-stranding HNPS is due to the fact that the empty category or null argument as an object of a preposition in the first coordinate clause ends up not being licensed appropriately. We also examine the hierarchical effects that HNPS exerts on the clause in volving it. (Dongguk University)