Method and system for assessing the trip performance of a driver

A system for automatically assessing performance of a driver of a current vehicle for a particular current trip, the system is arranged to repeatedly read updated current-trip driving data sets are from the vehicle, the current-trip data sets each comprises data from at least a predetermined set of extended driving data parameters, wherein the system is arranged to read new such current-trip data sets from the vehicle at consecutive observation time points separated by at the most a predetermined observation time period, wherein the system comprises a server, arranged to collect previous-trip driving data sets, observed at a plurality of different observation time points, for a plurality of different previous trips made by a plurality of different drivers and a plurality of different vehicles, the previous-trip data sets each comprises parameter values for both said set of extended driving data parameters and a predetermined set of a qualified parameter set, the qualified parameter set comprises the parameters of a basic parameter set and instantaneous vehicle energy consumption, wherein the server is arranged to group said previous-trip driving data sets into basic historic groups of such sets, based upon a basic driving data set similarity measure, the basic similarity measure is arranged to take values for said basic parameter set into consideration, and to calculate the value of a respective group performance parameter for each such basic historic group, wherein the server is arranged to further group said previous-trip driving data sets into extended historic groups of such sets, based upon an extended driving data set similarity measure, the extended similarity measure is arranged not to take all values for said basic parameter set into consideration that are taken into consideration by the basic similarity measure, wherein the server is arranged to, for each of said current-trip data sets, map the current-trip data set in question to at the most one particular of said extended historic groups, based upon an extended group conformity measure between a driving data set and an extended historic group, and wherein the server is arranged to calculate a current-trip performance parameter based upon the group performance parameter values of respective basic historic groups corresponding to previous-trip driving data sets comprised in the extended historic group to which a current-trip data set was matched.