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Recent studies indicate that CaII K emission during stellar flares produces a light curve analogous to soft X-ray emission during the gradual phase of solar flares. This has led to speculation that CaII K can be used as an optical proxy for X-ray emission in stellar flares. Despite the copious amount of work using CaII K for solar atmospheric and helioseismology studies, it is still unknown whether optical lines such as CaII K can consistently be used as proxies for X-ray emission in solar flares. Previous studies of CaII K during solar flares are either unrelated to the question of proxies, have inadequate temporal resolution, or are limited in the number of flares observed. I present a preview of a study involving over 30 solar flares in which flux calibrated CaII K, H$\alpha$, soft and hard X-ray emission are compared.
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