u201c 6 u201d u201c 7 u201d are listed for forward movement and u201c r u201d for reverse travel further in the top bar of the shifting scheme are to be found the individual shifting elements namely k 1 k 2 a b c d e f a u2032 e u2032 and e u2033 a gear efficiency rating eta of the planetary transmission 1 a total ratio i_ges of the planetary transmission 1 in accordance with the corresponding gear stage also a stage spring phi which respectively is arrived at from a quotient of the values of two successive total ratios i_ges in addition underneath the shifting scheme table is to be found the so called characteristic ratio namely i_o_p 1 u2212 3 0 i_o_p 2 u2212 3 0 i_o_p 3 u2212 3 0 of the planetary gear sets p 1 to p 3 with which the given total ratios i_ges in the respective gear stages and a total spread of 7 11 are arrived at those shifting elements of the planetary transmission 1 which must be engaged for the attainment of a gear stage are noted in the shifting scheme cells by a black dot conversely those cells exhibiting no black dot indicate such shifting elements which are respectively disengaged it is evident from the shifting scheme of fig2 and from the background of the gear scheme of the planetary transmission 1 as shown in fig1 that in order.