A screeding system for screeding an uncured concrete surface, said screeding system comprising: a screeding machine having a screed head assembly that is movable over uncured concrete to screed the concrete surface; a plurality of sensors disposed at said screeding machine; wherein said plurality of sensors comprises elevation sensors that sense an elevation of said screed head assembly relative to a reference plane established at the concrete area; a control operable to process data captured by said plurality of sensors, wherein said control processes captured data while said screeding machine is screeding the uncured concrete surface; wherein said screeding system is characterised by: said control, while said screeding machine is screeding the uncured concrete surface and responsive to said data processing of captured data, estimates a flatness or levelness or quality of the surface of the concrete being screeded; wherein, while said screeding machine is screeding the uncured concrete surface, said control generates an output indicative of the estimated flatness or levelness or quality of the surface; wherein said output comprises feedback to an operator of said screeding machine while said screeding machine is screeding the uncured concrete surface; wherein said output comprises a display viewable by the operator of said screeding machine; and wherein, responsive to data processing of data captured by a speed sensor of said plurality of sensors, said control determines a screeding pass speed while said screeding machine is screeding the uncured concrete surface and determines if the screeding pass speed is too fast or too slow, and wherein said display is operable to display an alert that the determined screeding pass speed is too fast or too slow. a screeding machine having a screed head assembly that is movable over uncured concrete to screed the concrete surface; a plurality of sensors disposed at said screeding machine; wherein said plurality of sensors comprises elevation sensors that sense an elevation of said screed head assembly relative to a reference plane established at the concrete area; a control operable to process data captured by said plurality of sensors, wherein said control processes captured data while said screeding machine is screeding the uncured concrete surface; wherein said screeding system is characterised by: said control, while said screeding machine is screeding the uncured concrete surface and responsive to said data processing of captured data, estimates a flatness or levelness or quality of the surface of the concrete being screeded; wherein, while said screeding machine is screeding the uncured concrete surface, said control generates an output indicative of the estimated flatness or levelness or quality of the surface; wherein said output comprises feedback to an operator of said screeding machine while said screeding machine is screeding the uncured concrete surface; wherein said output comprises a display viewable by the operator of said screeding machine; and wherein, responsive to data processing of data captured by a speed sensor of said plurality of sensors, said control determines a screeding pass speed while said screeding machine is screeding the uncured concrete surface and determines if the screeding pass speed is too fast or too slow, and wherein said display is operable to display an alert that the determined screeding pass speed is too fast or too slow. said control, while said screeding machine is screeding the uncured concrete surface and responsive to said data processing of captured data, estimates a flatness or levelness or quality of the surface of the concrete being screeded; wherein, while said screeding machine is screeding the uncured concrete surface, said control generates an output indicative of the estimated flatness or levelness or quality of the surface; wherein said output comprises feedback to an operator of said screeding machine while said screeding machine is screeding the uncured concrete surface; wherein said output comprises a display viewable by the operator of said screeding machine; and wherein, responsive to data processing of data captured by a speed sensor of said plurality of sensors, said control determines a screeding pass speed while said screeding machine is screeding the uncured concrete surface and determines if the screeding pass speed is too fast or too slow, and wherein said display is operable to display an alert that the determined screeding pass speed is too fast or too slow.