  Amorphous solids yield in strain-controlled protocols at a critical value of
the strain. For larger strains the stress and energy display a generic complex
serrated signal with elastic segments punctuated by sharp energy and stress
plastic drops having a wide range of magnitudes. Here we provide a theory of
the scaling properties of such serrated signals taking into account the
system-size dependence. We show that the statistics are not homogeneous - they
separate sharply to a regime of `small' and `large' drops, each endowed with
its own scaling properties. A scaling theory is first derived solely by data
analysis, showing a somewhat complex picture. But after considering the
physical interpretation one discovers that the scaling behavior and the scaling
exponents are in fact very simple and universal.
