Coherence Factor (CF) and Strong Phase (SP) measurement in neutral D-meson to short-lived kaon, charged kaon, and pion is instrumental in constraining unitary triangle angle "gamma". The amplitude interference between this singly Cabibbo-suppressed and Cabibbo-favoured decay differs from traditional methods, significantly contributing to global "direct gamma" measurement. Furthermore, these can also be used in charm mixing studies. The measurement is performed BESIII, an e+e- collider experiment, by studying the resonance, Ψ(3770), above the open-charm threshold. Quantum-correlated D mesons allow us to study the amplitude interference and calculate CF and SP.