  The QCD dipole picture allows to build an unified theoretical description
-based on BFKL dynamics- of the total and diffractive nucleon structure
functions measured at HERA. We use a four parameter fit to describe the 1994 H1
proton structure function $F_{2}$ data in the low x, moderate $Q^{2}$ range.
The diffractive dissociation processes are discussed within the same framework,
and a 6 parameter fit of the 1994 H1 diffractive structure function data is
performed.
  The BFKL dynamics can also be successfully tested at the $e^+e^-$ collider
LEP and a future high energy linear collider. The total $\gamma^*\gamma^*$
cross-section is calculated in the Leading Order QCD dipole picture of BFKL
dynamics, and compared with the one from 2-gluon exchange. Next to Leading
order corrections to the BFKL evolution have been determined
phenomenologically, and are found to give very large corrections to the BFKL
cross-section, leading to a reduced sensitivity for observing BFKL effects. The
Y dependence of the cross-section remains a powerful tool to increase the ratio
between the BFKL and the 2-gluon cross-sections and is more sensitive to BFKL
effects, even in the presence of large higher order corrections.
