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Cooperative diversity has recently been proposed as a promising technology to achieve spatial diversity in wireless networks. In, the performance of incremental amplify-and-forward (AF) relaying cooperative diversity networks is analyzed. In this paper, a new relaying scheme in conjunction with incremental decode-and-forward (DF) relaying and selective DF relaying strategies, termed incremental-selective DF relaying, is proposed and analyzed. Closed-form expressions for error probability of both the incremental-selective DF relaying scheme and the incremental DF relaying scheme are derived. The effect of signal-to-noise ratio (SNR) threshold on the error probability is discussed. Moreover, results show that incremental-selective DF relaying scheme outperforms incremental DF relaying scheme for all the cases we investigate.