Contributing ideas, helping problem solve, and participating in the discussion is the role of the <span>participant</span> in a peer review group. Participant it's one of the most important person in a peer review group so I chose this option.
Worth, worthy, useful, valuable, profitable, interesting, meaningful, praiseworthy, commendable, rewarding, desirable, laudable, advantageous, noteworthy, creditable, cost-effective, appropriate, notable, suitable, penalty, instrumental, purposeful, substantial.
