This case study aims to explore the best practice of applying task-based language teaching (TBLT) via the web conferencing tool Blackboard Collaborate in a beginners' online Chinese course by evaluating the technical capacity of the software and the pedagogical values and limitations of the tasks designed. In this paper, Chapelle's (2001) criteria for CALL task appropriateness are adopted and adapted to evaluate five tasks designed for an online environment in terms of practicality, language learning potential, learner fit, authenticity and positive impact. In the second semester, 2013, eight BA on-campus students who enrolled in an introductory Chinese language course agreed to participate in this project. Five fortnightly one-hour online sessions were conducted, which included two jigsaw tasks, two decision-making tasks and one information-gap task. Learners' interaction in the online sessions has been recorded and transcribed for a deep investigation of learners' negotiation actions in peer-peer interaction. Their experiences of using Blackboard Collaborate and tasks were recorded in in-depth interviews and pre- and post-session questionnaires. [For full proceedings, see ED565087.]