In this work we will examine these three steps by focusing on the time period when measurements underlying the TD estimates were conducted -typically one working day (the time basis in step 3, above). This represents a subset of a complete MII process, which must also account for source intermittency and episodic events, like blowdowns or upset conditions, changes in the operational state of facilities, etc. By focusing on the measurement period, TD and BU methods can be compared with minimal complications, highlighting how information can be exchanged between these methods to improve emissions estimates.