The proposal of measurement of double beta (beta beta) decay of Cd-106
is presented. The aim of the proposed project is the development of t
he experimental methods, construction of spectrometers and measurement
of the beta beta decay (beta+beta+, beta(+)/EC, EC/EC) of Cd-106 part
icularly the 2 nu EC/EC mode. The theoretical description and basic ex
perimental ideas suggested for the solution of the project are also gi
ven.