This activity delivers the conceptual design of diagnostics for an ignition facility operating at high repetition rates in harsh environments. It develops methods to monitor target positioning, implosion dynamics, and ignition using optical, X-ray, particle-beam, and nuclear techniques. Existing systems at NIF and Omega will be reviewed in light of recent advances, with emphasis on direct-drive geometry to support ignition studies for the European scientific community.This work package designs the advanced diagnostic systems required to monitor and control the fusion process under reactor-relevant conditions.