Grayscale first, then color cal, then re-check and fine tune grayscale if it changed. If you adjusted grayscale the second time, recheck color again. If color changes were made the second time, recheck grayscale again, etc. Keep checking, adjusting, re-checking as many times as it takes to get both grayscale and color right (or as close as possible) at the same time without adjusting either one. You might find that grayscale and color adjustments don't affect each other... consider yourself lucky if that's how your projector works. There are some out there that have little or no interaction between grayscale and color cal controls. But you always have to check to see what you are working with.