We combine a recent mapping of the Anderson-Mott metal-insulator trans
ition on a random-field problem with scaling concepts for random-field
magnets to argue that disordered electrons near an Anderson-Mott tran
sition show glasslike behavior. We first discuss attempts to interpret
experimental results in terms of a conventional scaling picture, and
argue that some of the difficulties encountered point towards a glassy
nature of the electrons. We then develop a general scaling theory for
a quantum glass, and discuss critical properties of both thermodynami
c and transport variables in terms of it. Our most important conclusio
ns are that for a correct interpretation of experiments one must disti
nguish between self-averaging and non-self-averaging observables, and
that dynamical or temperature scaling is not of power-law type but rat
her activated, i.e., given by a generalized Vogel-Fulcher law. Recent
mutually contradicting experimental results on Si:P are discussed in l
ight of this, and new experiments are proposed to test the predictions
of our quantum-glass scaling theory.