This thesis describes interactions between atomic or molecular systems and intense laser fields. Methods for time resolving sub-femtosecond scale Auger-type dynamics in molecules and atoms are discussed. The thesis presents a novel technique for recovering such dynamics by clocking the process with high-harmonic generation. The harmonic generation is driven by an attosecond pump pulse and a long duration, infrared pulse. The technique is then theoretically applied to Auger decay of krypton upon ionisation from the 3d subshell and inner-valence hole dynamics of small molecules. We then examine the extent to which these techniques, which utilise strong fields, can influence the electron dynamics they seek to measure. We describe the coupling between the bound state to a dressed continuum (as opposed to a field-free continuum) and the effect on the Auger decay rate in a sample system is calculated. We then look ahead to possible ways in which the probing strong field may influence the electron dynamics themselves.