[GSAS-II] GSAS-II size and microstrain model selection

[kasa belachew]

GSAS-II computes the crystallite sizes (  *10-6* m) in three different
(isotropic, uniaxial and ellipsoidal) and Microstrains in terms of the
amount of lattice spread, unitless fraction of Δd/d (or equivalently ΔQ/Q)
times 106 (isotropic, uniaxial and generalized) arrangement.
But, my question here is,
1. What is the criteria to select the model for my material?
2. Can we use all models for one material?
Thanks
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