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The chief purpose of congressional committees is to develop the legislation on the committee that they belong. In general, the congressional committees have three purposes which are: to help the public become aware of the key problems or issues, to choose or select bills that will be introduced and lastly, to allow the members divide the work. Hope this answer helps.

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hold hearings so that bills can be evaluated and studied prior to voting.

because. . .  

Congressional committees fall into four categories: standing, select, joint and conference committees. All four types of committees accept bills and ultimately decide whether to turn them into laws.