What design aids for large-scale application (using LV6i) exist?

I have a large-scale application that includes analog and digital I/O, motion control, multiple temperature readings, Ethernet communication, RS-232, DDE and ActiveX controls for communicating with other commercial software. We have to improve the system performance and ease the pain of maintaining and upgrading. What aids are there for large-scale application design and development?

This doesn't exactly count as development "tools" but I can send you copies of three papers that I found when I was just getting started with LV. They can show you how to think about your problem--and that is really the hardest (and most important) part.
Contact me directly and I'll email them to you. The archive is to large to post.
Mike...
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"... after all, He's not a tame lion..."
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class ParamI {
virtual string toString() = 0;
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public:
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private:
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What design aids for large-scale application (using LV6i) exist?

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