Software metrics proposed and used for procedural paradigm have been found inadequate for object-oriented software products, mainly because of the distinguishing features of the object-oriented paradigm such as inheritance and polymorphism. Several object-oriented software metrics have been described in the literature. These metrics are goal-driven in the sense that they are targeted towards specific software qualities. In this paper, we propose a new set of metrics for object-oriented programs; this set is targeted towards estimating the testing efforts for these programs. The definitions of these metrics are based on the concepts of object-orientation and hence are independent of the object-oriented programming languages. The new metrics set has been critically compared with three other metrics sets published in the literature.