Kreng-jai: Not giving feedback to a friend is a selfish act, because the friend will continue to make the same mistake in the future, to the point where career advancement is impossible if the mistake is serious. Or if the friend is promoted, he or she could create even greater damage because of a blind spot that you could have pointed out but didn't because you were too kreng-jai.
Instead of being kreng-jai, you can provide constructive feedback by doing the following:
1. Make it normal. "Nobody's perfect. I believe you had no bad intention by giving the wrong figure during the presentation."
2. Explain the benefits. "I want to give you some feedback so you won't have the same difficulty again in the future."
3. Show empathy. "I know that negative feedback is quite bitter."
4. State the facts. "The figure you gave for last year's revenue was incorrect."
5. Suggest alternative action. "Please be careful in the future. We should double-check all the key figures before putting them in the slides."
Raksa-nah: A lot of people don't follow up on work because they want to preserve the "face" of the other team member. But failing to follow up does more harm than good for that person, because he will lose a lot more face when it becomes clear that he was the cause of the delay by the whole team. Here are some tips to help you follow up professionally:
1. Agree with other members that there will be a follow-up process.
2. Ask what kind of approach fits each person's style.
3. Follow up according to the preferred style.
4. Do it in a polite and straightforward manner.
5. Observe the reaction during the follow-up. Make adjustments when necessary, e.g. if your style is too direct, perhaps be less assertive next time.