Technology is discussed for capturing performance measurements from Wireless Wide Area Network (WWAN) transmission points and Wireless Local Area Network (WLAN) Access Points (AP). The performance measurements can provide information about the interworking a WWAN and one or more WLANs that can be used to offload traffic from the WWAN. Also, an illustrative example of the collection of performance measurements at a WWAN is explained. Furthermore, the correlation, analysis, and general harnessing of performance measurements to optimize and/or maintain combinations between a WWAN and one or more WLANs is discussed, among other topics.