Defining coorientational accuracy as how closely one person estimates another's orientation to something cooriented, this paper examines the reasons why the concept has been favored as a criterion for communicating and how it has been measured. It notes problems in measuring accuracy with reference to various ways the orientation situation has been conceptualized, and proposes a new accuracy measurement technique that can be used to obtain a more comprehensive picture of orientation. The paper also examines the issue of accuracy measurement and discusses several types of measures for scoring accuracy, emphasizing their differences. The paper concludes with a suggestion that the concept of inaccuracy, which is not necessarily dependent on accuracy, also be studied. (FL)