A new set of velocity (f(v)) and shear (f(s)) slip correlations was proposed for improving the prediction by the extended and the double-slit trickle-bed mechanistic models, of the liquid hold-up, the total pressure drop, the wetting efficiency, and the gas-liquid interfacial area in the trickle flow regime. Amendment of the original f(s) and f(v) slip correlations(3,6) was motivated by the following incentives: (i) a much wider trickle flow regime database currently at disposal with in excess of 5,100 experimental data; (ii) application of a traceablity protocol to guarantee no corruption and normalization of the compiled data in the database; (iii) contrary to previous formulations reduction to one single set of f(s) and f(v) slip functions applicable to both the extended and the double-slit models. The slip functions were correlated in terms of gas Reynolds (Re-G), liquid Reynolds (Re-L), Fcoude (Fr-L), Weber (We(L)), Lockhart-Martinelli (X-L), and Stokes (St(L)) numbers. Implementation of the slip functions in the extended slit model yields liquid hold-up and pressure drop with an average absolute relative error (AARE) of 17% and 19.5%, respectively. Similarly, the double-slit model predicts wetting efficiency, gas-liquid interfacial area, liquid hold-up, and total pressure drop with AARE = 11%, 34.7%, 20%, and 18%, respectively.