The paper presents a prototype design tool-chain, called VARDA for the ARD+ conceptual design method for rules. The tool-chain is implemented in a Unix environment with the use of Graphviz visualization tool and SWI-Prolog. It supports the hierarchical design feature of the ARD+ method as well as an automated on-line visualization. This solution allows for rapid prototyping of ARD+ models, that can be integrated with the XTT-based rules. Tool-Chain features are presented using a complete rule-based system example.