This study investigates the factors of members' supportive behavioral intentions to donate and recommend membership to others in the context of engineering professional membership associations. Using data collected from 3,464 members across three engineering professional membership associations, this study found that age, past donation experience, personal and professional benefits, gender, income, and longevity in the field were significant factors to determine giving intention, while personal benefits, professional benefits, past behaviors (donation and volunteering), and longevity in the field were predictors of membership recommendation intentions of engineering professionals.

中文翻译：

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非营利协会成员支持行为的预测因素是什么？

这项研究调查了在工程专业会员协会的背景下，会员向他人捐赠和推荐会员的支持行为意图的因素。使用从三个工程专业会员协会的3,464个会员收集的数据，该研究发现，年龄，过去的捐赠经验，个人和专业福利，性别，收入和寿命在该领域是决定给予意愿的重要因素，而个人利益，专业福利，过去的行为（捐赠和志愿服务）以及该领域的寿命是工程专业人士推荐会员意向的指标。