Abstract: Measurement While Drilling technology (MWD) is a technique used to monitor and record the mechanical response of a drilling system. The measured parameters in geotechnical engineering typically include down pressure, torque, rotation speed, and penetration rate. These drilling parameters can then be combined using different physics-based or empirical equations to form compound parameters. One of the goals of MWD technology is to use these combined parameters for subsurface characterization and correlate the combined parameters to different engineering and index properties of the subsurface material. These correlations depend on the drilling rig type, the drilling operational procedure, and the geomaterial type (geology). In this study, the results of the MWD data from four different boreholes (drilled using a mud rotary method with tricone bits) in the state of Nebraska, USA were used to investigate the correlations between different compound parameters and SPT-N values. The soils encountered in these boreholes were low-plasticity and high-plasticity silts and clays. Specific energy (), drillability (), Somerton index (), soil-rock resistance (, alteration index (AI). The results showed that there are good correlations between these compound parameters and the SPT-N values. The main challenges in developing these correlations included preprocessing the data, dealing with the SPT refusal tests, correcting the SPT values for overburden pressure, and choosing the correct interval for calculating the average compound parameters. All these challenges and the solutions to overcome them are discussed in detail in this paper.