Geotechnical investigation is an essential requirement to the design and construction of civilrnengineering projects the behavior of soil properties is very challenging and unique nature.rnGeotechnical engineers usually attempts to develop empirical equations specific to a certainrnregion and soil type, but the soil behavior uncertainties involved in this process. The reasons forrnthis result can easily be related to quality of the in situ, borehole sampling and laboratory tests.rnIn addition, there is also a more important reason that affects the obtained results which is thernheterogeneous nature of the soil.rnrnDetermining of undrained shear strength and Swelling Pressure parameters in laboratory arernreally tedious and time consuming. Therefore, a correlation between undrained shear strength,rnSwelling Pressure and SPT with Liquidity Index are useful for restraint of testing number andrncosts. This study the data are obtained from results of field and laboratory tests that have beenrncarried out for Addis Ababa Housing project at koyefeche Condominium building site.rnrnAs a result of the studies the correlation are established the Undrained shear strength can bernestimated by Cu = 33.65ern-0.78ILrn with coefficient of determination (Rrn2rn) of 51.2 %, Swelling rnPressure can be estimated by Ps = 19.53 ILrn2rn -20.27 IL +30.73 with coefficient of determination rn2rn(Rrn) of 70.4 % and the better and more reliable correlation found SPT number Silt with high rnplasticity (MH) and Silt with low plasticity (ML) Soil. Finally, the output of this study canrnserve as a basis for detail investigation to carry out further correlation study by using carefullyrnperformed and well controlled borehole sampling and laboratory testing.