  Intermittency in fluid turbulence can be evidentiated through the analysis of
Probability Distribution Functions (PDF) of velocity fluctuations, which
display a strong non-gaussian behavior at small scales. In this paper we
investigate the occurrence of intermittency in plasma turbulence by studying
the departure from the gaussian distribution of PDF for both velocity and
magnetic fluctuations. We use data coming from two different experiments,
namely in situ satellite observations of the inner solar wind and turbulent
fluctuations in a magnetically confined fusion plasma. Moreover we investigate
also time intermittency observed in a simplified shell model which mimics 3D
MHD equations. We found that the departure from a gaussian distribution is the
main characteristic of all cases. The scaling behaviour of PDFs are then
investigated by using two different models built up in the past years, in order
to capture the essence of intermittency in turbulence.
