After the discovery of a Higgs boson, the measurements of its properties
are at the forefront of research. The determination of the associated
production of a Higgs boson and a pair of top quarks is of particular
importance as the ttH Yukawa coupling is large and can probe for physics
beyond the Standard Model.
The ttH production was analysed in various final states. The results are
reviewed with multileptons and $\rm H\rightarrow \gamma\gamma$ final states.
The combined results also including the $\rm H\rightarrow b\bar b$ decay
channel are presented.
The analysis was based on data taken in 2015 and 2016 by the ATLAS
experiment recorded from 13~TeV proton-proton collisions. The combined
results provide evidence for the ttH production modes and are compared
with the Standard Model (SM) predictions allowing models beyond the SM to