The Spectrum Collaboration Challenge will develop intelligent radio networks which can collaborate to manage and optimize the radio frequency (RF) spectrum in a complex dynamic, changing RF environment. Participating teams will be evaluated in a series of competitive, tournament-style matches. This solicitation addresses technical development for the competitions to: 1) ensure integrity of the scoring process, 2) develop realistic scenarios that define and drive the multi-network matches so as to simulate realistic RF environments, and 3) validate operation of the competition testbed components. Amendment No. 1: The purpose of this Amendment is to change the "Estimated period of performance start" from 5 December 2016 to 24 January 2017. The subject change is highlighted in yellow in the attached conformed DARPA-BAA-16-48 document. Amendment No. 02: The purpose of this Amendment is to make changes as highlighted in yellow in the attached conformed DARPA-BAA-16-48 document.