Example: one feature comes that needs to be built:
-> Team divides into 3 stories
1st story - 13
2nd story - 8
testing story - 8
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the reason we create a separate testing story, is to not show such huge nos. on the board
we could not have created 1 single story and showed pointers as - 13 + 8 + 8 = 29
neither, 13 + 8 = 21 ( inclusive testing), another 8 for remaining
instead i follow, 3 stories with their effort as i showed above ( 13-- 8 --8)