During a group interview at Rolls-Royce, sixty seconds before time was called, something compelled me to add two structural elements to what the group had built. When the interviewer asked why, I said: to keep it together.
Without a word, he walked to the model and removed one of the pieces I had added. The entire structure collapsed.
That moment is the practice. The critical piece is rarely the most visible one. It is almost always the one nobody thought to name — until it is gone.