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We investigate properties of Waring decompositions of real homogeneous forms.We study the moduli of real decompositions, so-called Space of Sums of Powers,naturally included in the Variety of Sums of Powers. Explicit results areobtained for quaternary quadrics, relating the algebraic boundary of ${\rmSSP}$ to various loci in the Hilbert scheme of four points in $\mathbb{P}^3$.Further, we study the locus of general real forms whose real rank coincideswith the complex rank. In case of quaternary quadrics the boundary of thislocus is a degree forty hypersurface$J(\sigma_3(v_3(\mathbb{P}^3)),\tau(v_3(\mathbb{P}^3)))$.

Spaces of Sums of Powers and Real Rank Boundaries