The data collected in the third phase are not specified before the first  they emerge, often with surprises, from the initial observations.
Data collected in the third phase may be surprising and unexpected based on initial observations.
There are two phases to data collection to keep the process swift.
A man is riding a motorcycle.
A pianist is playing a piano.
My boss has had more than one wife.
For use in smoking.
A man with a buzz cut walks on a football field.
The church dates back to the fifth century.