Lightly blanch green beans. Don't overcook. Cool in a bowl of cold water, then cut into 1/4 inch pieces.
Peel cucumber. Seed and cut into 1/4 inch pieces.
Seed and cut yellow or red pepper into 1/4 inch pieces.
Seed and dice tomatoes into 1/4 inch pieces.
Chop fresh basil leaves.
Chop fresh parsley.
Toss in corn and gently mix ingredients together.