Kindly digest the cases hereinafter provided, using this format: (1) Facts of the case; (2) Issues; (3) Ruling/Decision of the Supreme Court.

1. GSIS vs. Montesclaros (G.R. No. 146494)

2. Galman vs. Sandiganbayan (G.R. No. 72670)

3. Bautista vs. Court of Appeals (G.R. No. 157219)

4. Mirasol vs. DPWH (G.R. No. 158793)

5. International School Alliance of Education vs. Quisumbing (G.R. No. 128845)