Splitting Families and Complete Separability We answer a question from Raghavan and SteprÄns by showing that $\mathfrak{s} = {\mathfrak{s}}_{\omega, \omega}$. Then we use this to construct a completely separable maximal almost disjoint family under $\mathfrak{s} \leq \mathfrak{a}$, partially answering a question of Shelah. Keywords:maximal almost disjoint family, cardinal invariantsCategories:03E05, 03E17, 03E65