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Whether these jumps obey the same simple theory as other avalanche systems, and what sets the largest size, is unsettled.","posed_since":"2001","precise":"Compression of micropillars (Dimiduk et al. 2006) and acoustic emission in ice and metals give slip-size distributions $P(S) \\sim S^{-\\tau} \\operatorname{exp}(-S/S_{0})$ with $\\tau \\sim 1.5 \\text{ to } 1.6$. Determine whether the critical behavior is mean-field depinning ($\\tau = 3/2, S_{0} \\sim (\\sigma_{c} - \\sigma)^{-2}$), a distinct class set by long-range dislocation interactions, or criticality without a tuning parameter, and how $\\tau$ depends on crystal structure (FCC versus BCC) and temperature. An answer is a classification with $\\tau$, cutoff scaling and average avalanche shape.","problem_ref":null,"references":"","settled_by":"Stress-resolved avalanche statistics and avalanche shapes from experiments and 3D dislocation dynamics agreeing on exponents and cutoff scaling.","status_note":"","title":"Universality class of dislocation avalanches in 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