First, the requirement for a spring thruster designed to help separate the two spacecraft had caught their attention, since the failure of this thruster to compress properly could prevent completion of docking. Second, Lunney and Bushuyev emphasized the importance of an indicator that would verify that the structural latches were properly in place. The American system provided information on the functioning of each latch but did not indicate that the interface seals were compressed, while the Soviet system gave data on compression of the seals but none for the latches.
The focus was on a spring thruster to separate spacecraft and a verification mechanism for latches.  Both systems had limitations in providing complete information regarding their respective components' functionality.