The paper presents the experimental results of a series of nine prestressed concrete beams without stirrups failing in flexure and in shear. Some theoretical considerations are also proposed on the basis of a theory previously developed by the authors with respect to shear strength in reinforced concrete members (Tureyen and Frosch 2003). The innovative design of the tests as well as the well-documented data presented by the authors have allowed the discussers to investigate a number of aspects with respect to shear strength in prestressed members. A series of independent conclusions and interpretations derived from this analysis may complete those proposed by the authors. As shown by the tests of the paper, beams are developing shear (diagonal) cracking at a given load level. Such cracking, however, does not lead to failure of the specimens, and load can be significantly increased before failure. For two specimens (V-4-0 and V-4-0.93), the increase meant that yielding of the flexural reinforcement was reached and bending was governing for the strength. For the other seven specimens, failure also developed in shear, but at a load 42% higher on average than the shear cracking load. The increase on the failure load with respect to the shear cracking load can, in the discussers’ opinion, be explained and calculated accounting for the different regions of Kani’s valley (Kani et al. 1979). Figure 12(a) shows a sketch of Kani’s valley and its two governing regimes. The ascending branch (named “crack propagation” in the figure, see Point A) is due to a sudden propagation of a flexural crack as it develops through the theoretical compression strut carrying shear. Such failure (disabling the teeth action as proposed by Kani) is followed by a total loss of load-carrying capacity of the member and is often named diagonal shear failure. The descending branch (named “direct struting” in the figure) has a different nature. Flexural cracks may reach the location of the theoretical compression strut carrying shear and develop through it (Point B in Fig. 12(a)) but they do not progress in an unstable manner. Instead, once such inclined cracks have developed, they can widen progressively as the load increases. A typical crack pattern illustrating this case is plotted in Fig. 12(b)