An authored documentary is a documentary that presents the subjective view of its author on the topic of the documentary. In sharp contrast to observational documentaries, which are supposed to be unbiased, authored documentaries are intended to present a definite point of view. They tend to be popular with audiences favoring the positions they advocate, because of their ability to mobilize popular opinion and interest. For the same reason, they tend to stimulate public controversy.[1]: 102 At an extreme, authored documentaries may take the form of "hybrid" documentaries that incorporate techniques used in fiction.[2]