Which training transfer concept may be described as serving as the ultimate barometer of training effectiveness as it describes how changes in individual behaviour, as a result of training, impact organization-wide results?

A) horizontal transfer
B) vertical transfer
C) parallel transfer
D) positive transfer

Vertical transfer is the concept that describes how changes in individual behaviour, as a result of training, impact organization-wide results. It is considered the ultimate barometer of training effectiveness because it measures the ability of the training to produce tangible results that positively impact the organization as a whole. The other options (horizontal transfer, parallel transfer, and positive transfer) all describe different types of transfer of training, but do not measure the impact of training on organization-wide results.