ABSTRACT: In this study, the stability of two rock slopes was evaluated by means of kinematic analysis, SlopeStability Probability Classification System (SSPC), and Slope Mass Rating (SMR). The results of thekinematic analyses have revealed that planar, wedge and toppling failures would not occur in the analyzedslopes. Based on the SSPC orientation–dependent stability analysis, the slope–1 has 100% stabilityagainst the sliding failure, and over 95% stability against the toppling failure. The probability of stabilityof the slope–2 is over 95% against the sliding and toppling failures. The maximum possible heights anddip angles of the slopes were determined according to the orientation–independent stability analysis.Based on the SSPC orientation–independent stability analysis, the angles for a safe slope are proposed tobe 75° for the slope–1 and 70° for the slope–2. According to the SMR system, the stabilities of the slope–1and the slope–2 were determined as “partially stable” and “unstable”, respectively