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谢老师在进行信息及其特征的教学时，确定了下列教学目标：知识与技能：学生能理解信息的基本含义，理解并能辨别信息的基本特征过程与方法：学生通过案例分析，增强分析问题的能力情感、态度与价值观：感受信息对人类社会的重要作用，激发对信息技术学科的学习兴趣根据上述目标，谢老师又设计了详细的课后作业：观看人类信息技术革命视频，就如下问题选择一种软件工具（如：Word、PowerPoint等）撰文，不少于300字：感受信息：你感受到哪些信息？（至少列出5个）感受信息技术：你感受到哪些信息技术？（至少列出3个）格式要求：①有封面页、标题、作者及时间；保存文件名为：学号姓名一信息及其特征作业；以邮件附件形式发给老师，邮件主题：姓名信息及其特征作业。谢老师批阅了很多同学的作业后，发现有相当一部分同学为了美观，在Word文档或PowerPoint文件中插入大量图片，而对信息和信息技术的感受却只有寥寥数语，有些“喧宾夺主”，偏离此次目标。谢老师开始琢磨如何能明确作业的重点，让学生更好地把握学习目标。问题：(1)谢老师采用的作业作为一种表现性评价分别对学生和老师有什么作用？(2)请帮助谢老烯改进作业要求，使同学们能够把握学习目标。
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