Attraction and commitment to a group is likely to be greatest when group members:

Attraction and commitment to a group is likely to be greatest when group members found themselves to be valuable to each other. This goes a long way to create the feeling of solidarity and dedication among each member of the group. For example, a non- volunteer group that assist in ensuring that the government is held accountable for their actions.

Explanation:

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productive most commonly means: achieving or producing a significant amount or result.

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productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.