Knife skills make such a difference. When my partner is helping me in the kitchen, I normally give him one vegetable to dice, and I dice everything else.

I can give him a bell pepper, and by the time he's finished with one bell pepper, I've diced two other bell peppers, the onions, the celery and the chicken.

Or if we're dicing and roasting potatoes, he'll dice one potato in the time it takes me to dice 3 or 4.

Most of the time he just cleans up after me or sets the table and we find that a better arrangement.