I'd definitely offer my help in the following form: - I'd ask, if he'd be interested in sitting down together and talking his situation through - I'd try to find out, why the member thinks he/she is underperforming and what the problems are in not meeting the expectations - if the problems are more of a psychological nature I'd offer my help in finding professional support - I'd suggest to help by -> practicing his tasks with me and suggesting improvements -> encouraging him/her to talk with other peers and the team lead about his situation, thus maybe lowering his/her goals for a certain period of time, to lower the pressure -> sharing my "secrets to success", my actions to reach my goals
I think this first of all depends on whether I have responsibility over his/her performance (e.g. as project leader) or not (so we are just colleagues). Let's assume I'm a colleague. Probably approaching the other person is the most difficult task, since he/she is likely somewhat ashamed about the underperformance and struggles to discuss it. So I would try to shift such a talk in a very causal ambience, e.g. going for a beer or so. Before mentioning the performance topic, I would start by trying to understand whether the person is having a good time in the company/private life/... (if they eventually mention their underperformance first, things are much easier). Once the performance topic is reached, my further behavior would depend on her reaction > in case the person seems a little under-confident and fussed about the work, I would offer i) some immediate help by discussing the work process and clarifying some issues, ii) some coaching (in case I am good in the task) or iii) to switch roles for some time (in case I do something different) and see whether they get better along with what I do. > in case the person does not seem to care a lot about work performance, I would most likely report the case the team leader.
various questions about work experience .. tell me about something you've learnt in the last year that could help you in this role ? ...what motivates you ? .... give an example of something you've done to improve your work process ? ..