It is important, however, to recall that neither Born or Schrödinger's insights were supported by rigorous derivation. There are no simple statements from which quantum mechanics can be bootstrapped, in contrast to Einstein's theory of relativity. As described in 11 "It's a complex framework, but it's also an ad hoc patchwork, lacking any obvious physical interpretation or justification". It is outside of the scope of the current contribution, but there is a vibrant effort in theoretical physics to engage in a 'quantum reconstruction'. This effort began in 2001, and sought to focus on probabilities, ignoring wave-particle duality, and quantization. Accordingly, it is enough to assume that any system can be described by a list of properties and their possible values, and from this much of 'traditional' quantum theory can be recovered .