This question already has an answer here:
What are the most effective ways in which one would utilize a small softbox; the most effective use-cases really that you'd recommend for it? For argument's sake let's call it 8"x9" (20cm X 23cm) in size, like the Strobist-recommended Lumiquest Softbox III.
Would you use this for indoor portraiture as a key light, or is it too small?
Would you consider using it for a fill light for an umbrella - again, indoors - or is it too small as a fill light, even up close?
Those are the two indoor use cases I can think for it. Strobist has some outdoor use cases in his blog.
Wondering what people's thoughts are: is this doable, or are people thinking, "No way, use a large light source for proper indoor portraits" (and if so, why).