Once the tests were concluded, the researchers found a few key insights to indoor positioning.  There are vast variations in the RSSI readings of BLE signals, making the error of the positioning algorithms tested relatively high.  The device moving around, other people near the device, fixed obstacles near the device, the presence of other devices near the device, and orientation of the device and iBeacons make large, unpredictable changes to the RSSI.  These variances create a huge challenge for implementing BLE indoor positioning in crowded and dynamic environments like shopping malls and airports.