In this study, the pelformance oln.vo statistical methods. namely intraclass correlation coeffiCient (R1) and Bartlell test stalistic in conjunction with various suggested window widths are investigated to idel1tify so il layer boundaries. The study is done using three fairly different CPT soundings obtained from the database of National Geotechnical Experimental Sites. The identification oOayer boundaries and demarcating the soil profile into homogeneolls layers is very important in geotechnical engineering. From this study. RJ appears to be a more pmverful. robust and persistent too/ and the corresponding suitable window width was proven as a fill1ctiol1 ofaverage distance between boundaries which could be determinedJrom autocorrelation analysis. Furthermore, a simple approximate method is also proposed in this study to estimate the suitable window width using the concept of average distance between 'mean-crossings '. The approach was exploited and substantiated as a simple, quick and accurate estimator in making the first approximation on suitable ,vindow width for bOlll1dQ/y identification exercise.