There are many difficult problems with deciding the question posed by the title to this section. Chris Riesbeck [Riesbeck 1997] has suggested that GBS tools are like encyclopedia indexes--building the very best index in the world is challenging research, but people will evaluate the encyclopedia on the strength of its entries; the index is transparent unless it gets in the way.
INDIE is much the same way--students don't see INDIE, they see a multimedia interface that presents material that is good or bad on its own merits, regardless of INDIE's internal structure. INDIE is a generic interface-builder with model that authors can use for both good GBSes, lousy GBSes, and even things that aren't really even GBSes.
Still, it isn't an entirely fruitless task to see if INDIE produces something that is of good quality. There are two measures that we will use here: a review of the feedback given by users of one of the shipped INDIE applications, Is it a Rembrandt?, and then a discussion of the overall leverage INDIE gives authors on the GBS-building process.