 While the algorithm for assessing a system's formula_12 and conceptual structure is relatively straightforward, its high time complexity makes it computationally intractable for many systems of interest.Heuristics and approximations can sometimes be used to provide ballpark estimates of a complex system's integrated information, but precise calculations are often impossible.These computational challenges, combined with the already difficult task of reliably and accurately assessing consciousness under experimental conditions, make testing many of the theory's predictions difficult.