whAt is thE mAin purposE oF thE pAssAgE you hAvE just hEArD
A．to DisCuss DiFFErEnt ConCEpts.
B．to introDuCE A nEw mEthoDology.
C．to tAlk ABout ConCEptuAl systEms.
D．to introDuCE A rEsEArCh pApEr.