求教关于self report 在individual level 的使用

快乐小神仙

有这么一道题，本人死活没搞清这题问的是什么。题目是这样的：

If you want to study the relationship between group helping (altruistic) behaviors within the group and group cohesiveness,
(1) Name two ways you can measure altruistic behaviors by self-report at the individual level? (please write out the item) How would you analyze the data?
(2) Name two ways you can measure altruistic behaviors by other-report at the individual level? (please write out the item) In what way would you collect your data?
(3) Name two ways you can measure altruistic behaviors at the group level.

我就是死活也没弄清楚这题所说的2 ways指的是什么。举第一题为例，我的想法是使用qualititive self report approach即所谓semi-structured interview和quantity self report approach即所谓written questionnaire。 请问我这么理解对吗？

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搞不懂