What is a method that could be used to test the effect of temperature on the rate of reaction of a cellulase?

One method could be to set up multiple reaction vessels with the same concentration of cellulase and substrate, but at different temperatures. Measure the rate of reaction by monitoring a specific parameter (e.g., substrate concentration over time) for each reaction vessel. Plotting the data will allow you to observe how temperature affects the rate of reaction of the cellulase.