twam scoring is based on a weighted average of the individual Scan Module grades; some Modules have greater weight than others.
However, the more Scan Modules executed in a single scan, the likelihood of the overall twam score will be accurate is increased.
Weights are manually tweaked based on a number of factors and are currently not published in an effort to protect certain aspects of how the overall twam score is computed.
note: returned twam score values are currently being calibrated and tested pre-1.0 release and are thus liable to change in scale