In this chapter, the wave equation is considered, at all times t∈ ℝ, in a domain G⊂ ℝⁿ. The boundary ∂G contains finitely many smooth edges ℳ_m of various dimensions 0 ≤ dim ℳ_m≤ n− 2 ; outside of the union of edges, the boundary is smooth. The Dirichlet or Neumann conditions are given on ∂G∖ ∪ _mℳ_m. We use this problem to demonstrate the method of combined estimates and derive the asymptotics of solutions near the edges.