Please use this table when you post (same format).

Action

Yes/No

Reasons

Find out if person X has a genuine reason for not doing the work

Ignore person X and do his/her work yourselves

Assuming there are no mitigating circumstances then contact person X and say you need them to do their share - refer to ground rules and what they have to do to complete the project.Do this in writing - email or letter -from the whole group - ensure a date for reply/action- retain a copy.

Report person X to your manager if you get no response) explaining which part of the project person X is responsible for.

Some of your ideas.......