In the case study presented in this unit's video, IPMVP Option C was used to determine energy savings from the energy interventions. However, using Option C provides overall savings, and no differentiation is made between savingsbrought about by each individualECM and the savings from interactive effects that may have resulted from the ECMs. (Note: You can find the transcript for the case study video in this module's downloads folder.)

1.1 What interactive effects may have resulted from the ECMs? (Max. 50 words.).