In this paper we discuss the concept and design of a new CALL (Computer Assisted Language Learning) system being developed to aid students learning Japanese as a second language. The system is being designed to allow students to create and speak their own sentences based on visual prompts, before receiving feedback on their mistakes. The students may choose to receive guidance in order to complete each task, selecting the level of help that best suits their needs. Having described the concept of the system and its design, we discuss some tests recently carried out using a prototype of the system, summarize the results obtained, and give some thought as to the significance of these results on the future development of the system.