The DiSC is the industry standard profiling instrument. DiSC has been used by more people than any competing product. And, only DiSC can trace it's history back to the time when William Marston's work was used as the basis for the original DiSC profile. DiSC research with DiSC users has resulted in several upgrades to the DiSC, culminating in the DiSC Classic and DiSC online versions. The DiSC technology embodied in the DiSC Classic and DiSC online versions is widely recognized as extremely efficient and user-friendly.