The present work identified possible factors that led some collaborative network organizations to close. The case study was based on experiences obtained in networks that took part of the Collaborative Network Program of the State of Rio Grande do Sul (Brazil). One of the Program creators, managers, consultants and entrepreneurs of six networks that broke down were interviewed based on a semi-structured instrument. The analysis of the Collaborative Network method indicated that important factors could motivate the failure of networks, which were validated with the integrated model of alliance failure proposed by Park and Ungson [1]. The article ends by suggesting some improvements in the Collaborative Network Program of the State of Rio Grande do Sul to become more efficient and contribute to the network success.