Use some of the data reported by Yairi to support your opinion. General reasons given are that girls are more likely to recover, children from families of recovered stutterers are more likely to themselves recover, and children who do not have other communication disorders are more likely to recover. Children who sponteneously recover could do so in an opposite direction, whereby they begin recovering within disfluent utterances. They could recover from between-word disfluencies by pausing silently or slowing down, uttering an interjection, etc. The main reason is that Johnson and his associates interviewed parents as late as 11 years post-onset of the children's stuttering, in order to support a theory about the onset of stuttering.
Parental recollection can be a major caveat in such a methodology.
Use some of the data presented in the handout to construct a list of the top three measures you think should be taken in an assessment of a child who is suspected of stuttering. Frequency of stutters, type and quality of stutters, and presence of disfluency clusters are the top three measures I tend to look for. Yairi's data supports that frequency would be important because children who stutter, after about 2 months since stuttering, have about five times more stutters than children who do not stutter. Yairi reports data to support the need to listen for quality of stutters, such as fast rate of iterations and number of iterations. Yaruss et al.