An industry technology roadmap (hereafter ITRM) is a strategic planning tool to predict the technologies and innovations demanded by the future market, allowing the industry to leverage capital and other investments in a range of alternative technologies and achieve sustainable development. To date, ITRM has been adopted by various global organizations in different industries; however, the majority of research has focused on roadmapping techniques only. Although success factors have been mentioned in some of the literature, little work has been conducted to assess the success of any ITRM. This research, therefore, developed an assessment model, including a theoretical and knowledge framework, assessment methods, and quantitative indices, to systematically assess the contents of an ITRM. We then used it to assess four global textile ITRMs. The assessment results led us to recommend five success factors of an effective ITRM: (1) methodological industry technology roadmapping; (2) a multi-organizational background; (3) systematic presentation of ITRM contents; (4) balanced contents for market and technology forces; and (5) appropriate databases. Compared with the success factors proposed in the previous literature, these five success factors are more practical for roadmap content construction.