A methodology to adjust resonance parameters is developed and rested on the
lowest-energy resonances of U-238, Pu-240, and Pu-242. It is shown that ad
justing the basic nuclear parameters is the only consistent way to adjust i
nfinitely dilute cross sections and to reduce the cross-section deconvoluti
on problem. Taking into account the self-shielding effects enables Ils to t
reat different kinds of integral experiments (fast and thermal) and to achi
eve a statistically consistent adjustment. Also, the standard multigroup cr
oss-section adjustment in the epithermal region can be interpreted as an in
dication of the required correction of an average reaction rate.