Four recent measurements in p‐p and n‐p scattering below 520 MeV are used to indicate the influence that new experiments can have upon phase parameters derived from the expanded data base. The cases are described separately and the collective effect upon energy dependent analyses is discussed. The representations used in this discussion are from the recent VPI analyses of 1135 pp data from 1 to 500 MeV, and 1386 np data from 0 to 425 MeV.1The analyses consisted of an Energy Dependent Analysis (EDA) involving 46 variable parameters and producing an overall &khgr;2of 2815 for the 2670 data. The EDA was complemented by single Energy Analyses (SEA) of data binned around 7 energies. The local energy dependence within a bin was that given by the EDA; some results of those analyses are given in Table I of Ref. 1 which summarizes the binning and fitting through SEA’s and Table II which gives the resultant phase parameters at 7 energies. Some indication of how well the SEA minima could be described by a quadratic expansion in the parameter space (the usual error matrix approximation) can be seen in the last column of Table I, where the 2n derivative matrix was used to predict &khgr;2for the binned data and the EDA fit; it compares favorably to the actural (data) values. Figure 4, Ref. 1, indicates the distribution of n−p scattering data which is used for the determination of I=0 phases. It is certainly the weaker component of the data base consisting almost entirely of &sgr; (&Vthgr;), &sgr;Tand P with larger experimental uncertainties than for corresponding p‐p quantities.Although we use these particular analyses to measure the effect of newer data, the conclusions are certain to be generally valid when applied to other analyses. The results of these studies, which are based upon preliminary data, should not be taken as a final indication of the phase parameters which will be obtained when the data is properly incorporated into the data base.