I have found that when writing, it is not too difficult to come up with a bunch of riffs but it is quite difficult to string them together.The worst feeling is having a nice sounding riffs loop endlessly with nowhere to go, hah. However, I see bands like Between the Buried and Me and others of the sort taking a wealth of riffs and stringing them together with seemingly no hassle. I know at times they add slight pauses between parts but even when they dont its fluid and works well musically. Are there any techniques that can be used to transition from riffs to progressions or from riffs to other riffs without sounding choppy? I apologize if my terminology is wrong, but it was the easiest way to explain it.