Regarding taskwork team processes, nominal group technique lowers social loafing and production blocking, which are both problems associated with brainstorming, by$...$

making people write down ideas on their own.

making people pool their ideas in a face$-$to$-$face meeting.

making people speak in turns during all face$-$to$-$face meetings.

making people agree to one idea generated in a face$-$to$-$face meeting.

discouraging bad ideas in the meeting.