normally a basic model of EW sequence consists of 8 waves: first 5 called impulse and named after 1 - 5 respectively, the other 3 called correction and named after A B & C respectively. There are quite a few variants of EW. But the basic one could be the one we see often. Different EW seq can be viewed within different time frames. EW of bigger frame can contain a few sub EW or fractals.