Importance of a conversational speech sample

A fluency student of mine had a trienniel evaluation coming up.  I administered the Stuttering Severity Index  and did not notice any dysfluencies.  I was still seeing him for intervention and decided to walk around the track with another fluency student so we could engage in a naturalistic conversation.  I heard part and whole word repetitions during his conversational speech sample.  I was able to write the report, and recommendations and make service recommendations.  A naturalistic setting as ASHA reports (2004), is where the most change takes place.  It eliminates the contained therapy room environment and opens the SLP to the students world without the therapy walls.