  The study of open/closed string duality and large $N$ duality suggests a
Gromov-Witten theory for conifolds that sits on the border of both a closed
Gromov-Witten theory and an open Gromov-Witten theory. In this work we employ
the result of Jun Li on Gromov-Witten theory for a projective singular variety
of the gluing form $Y_1\cup_D Y_2$ to extract Gromov-Witten invariants of a
conifold.
