Over high heat, in a pot of salted water, put the barley and bring to a boil. When it boils, cover and simmer on low heat for 1/2 hour or until tender. Drain, rinse, and set aside.
Over medium-high heat, in a hot griddle, grill the chicken for 2 minutes each side if thin or more if the cut is thicker. When they are cooked, chop then set aside.
Over medium heat, in a saucepan with extra virgin olive oil, sautè the tomatoes for 1 minute.
Add the chickpeas, barley, and sage. Toss for 5 minutes.
Add the chicken.
Season with balsamic vinegar, salt, and pepper. Toss for 1 minute.