In collecting data, it is also important to distinguish between compliance monitoring versus effectiveness monitoring — both types of monitoring are important. Compliance monitoring measures whether the implementing institution did what it said it was going to do (e.g., install 5,000 low-flow showerheads, or to use the above example, the noise protection walls have been installed), while effectiveness monitoring measures whether the actions achieved their intended result (e.g., reducing water usage by 20% per household, or the decibels behind the wall are a certain rating lower). Of course, the real measure of success is effectiveness, i.e., how well conditions are improving. However, compliance monitoring is a critical piece of the evaluation process to help determine whether implementing institutions have fulfilled their commitments, and it helps to analyse why goals were not reached where this is the case