3. The method of claim 1 , further comprising: splitting a segment of the series of segments into two or more segments when a topical coherence value of the segment satisfies a threshold coherence value.
3. The method of claim 1 , further comprising: splitting a segment of the series of segments into two or more segments when a topical coherence value of the segment satisfies a threshold coherence value. 4. The method of claim 3 , wherein splitting the segment comprises: dividing the segment into two substantially equal-sized sub-segments; and moving a user action of the segment between the sub-segments if the moving improves the topical coherence value of the sub-segments.