The purpose of this paper is to construct $ulcorner$CIDEAR(Cross Impact-DEA-AR)$lrcorner$ model which evaluates proposed R&D projects considering cross impact among them and selects proper projects to utilize resources efficiently as well as to maximize efficacy of investments. For this purpose, $ulcorner$CIDEAR$lrcorner$ model is designed as the following six steps. $ulcorner$Decision Theory Evaluation Model$lrcorner$ is for setting and selecting the evaluation items according to the structured procedure of evaluation system. The priority of items is decided at $ulcorner$AR Decision Model$lrcorner$$ulcorner$Cross Impact Estimation Model$lrcorner$ is for computing the final probability of success and the result is used to revise the evaluation results of $ulcorner$Decision Theory Evaluation Model$lrcorner$. $ulcorner$Resource Performance Analysis Model$lrcorner$ classifies the proposed R&D projects on the basis of required resources and expected performance. Consequently, the possibility of bias of project selection can be prevented. $ulcorner$Priority Oder Decision Model$lrcorner$ is for computing the efficacy of proposed projects. Finally, $ulcorner$Efficacy-Efficiency Cause Analysis Model$lrcorner$ analyzes the structure of efficacy and efficiency of the projects. The major findings and significances of this study are summarized as follows: (1) $ulcorner$CIDEAR$lrcorner$ model can deal with the affairs of R&D projects having the characteristics of mutual independence as well as mutual dependence in the point of efficacy and efficiency. Hence, it is possible to evaluate and select R&D projects more accurately. (2) It can be possible to raise the possibility of projects success. R&D manager can use the information for project management because the efficacy-efficiency structure of selected projects can be analyzed. (3) We proved the usefulness of the constructed $ulcorner$CIDEAR$lrcorner$ model using an case about twenty-one R&D projects of a leading company of electronic industry in Korea.