This report, the so-called Red Book, describes the outcome of the mission definition study (Phase A) for the PLATO mission. PLATO is a medium-size (M-class) mission of the ESA Cosmic Vision 2015-2025 programme, and competes for one of the two launch slots foreseen in 2017 and 2018.
You can find it here.
Last update on 19 September 2017