在软件服务化环境中，传统的通过直接交互发现需求的方式，因为不具有规模可扩展性，而不能有效适应软件服务化环境中"用户群体的大规模性"和"群体需求的多样性"这两个重要特点。针对该问题，本项目旨在探索一种基于间接交互的协同式需求建模方法，实现对软件服务化环境中大规模用户群体的多样性需求的有效发现；更为形象地说，正如蚁群/蜂群通过"环境激发效应"这种间接交互机制协同构造了具有复杂结构和功能的蚁巢/蜂巢一样，我们期望探索一种类似的协同方法，使得在软件服务化环境中，特定领域的大规模用户群体能够通过个体之间的间接交互，涌现形成该用户群体的需求模型。具体而言，本项目将从两个方面展开研究：一，在面向特征的需求建模方法的基础上，借鉴社会性昆虫群体的群体协同理论，研究并建立基于"环境激发效应"的协同式需求建模方法理论模型；二，在此基础上，应用蒙特卡罗统计方法，通过仿真的方式对理论模型的正确性和统计特征进行分析。

In SaaS environment, it is usually infeasible to discover requirements by the direct interaction between requirements engineers and users, because of the large scale of the potential user group of a SaaS application, and the intensive variabilities of requirements from the large-scale user group. This project aims to explore an indirect-interaction based collaborative requirements modeling method, to efficiently and effectively discover the requirements of a large-scale user group with intensive variabilities. As a metaphor, just like a colony of ants or bees collaboratively building a nest with complex structures and functions, from the stigmergy-based indirect interactions between ants or bees, we want to build a similar collaborative method to enable the emergence of the requirements model of a user group in SaaS environment, from the stigmergy-based indirect interactions between users. In particular, the research of this project are twofold. First, this project will build a formal model for stigmergy-based collaborative requirements modeling, based on the feature-oriented requirements modeling methods, and the collaborative theories for social insect colonies. Second, this project will apply a simulation-based approach to analyzing the validity and statistic properties of the formal model for stigmergy-based collaborative requirements modeling, based on the Monte Carlo statistical methods.