Teams setting goals on timelines is great for staying on track. Meeting the goals in the confines of the timeline gives a huge sense of accomplishment and inspiration to the team. The sense that says, “We can do anything!”
Missing, on the other hand, is frustrating. When collaborating with people and systems, timelines must be adjusted for uncertainty. You may deliver on your end, but what if a vital member of your team gets sick? What if the only connection you have to make something happen is away on vacation?
You have a choice. Adjust your timeline or stress about the unmet goal you have no power to manipulate one way or another.