That is why the retrospective meeting is at the heart of agile. A truly "agile light" setup would be:
Every other week, do a retrospective.
That's it!
On the retro, ask yourself 3 questions (or work with these 3 themes):
1. Is the way we are working helping us, and the rest of the organization, make the right decisions and reach our goals in an efficient way? If not, what needs to change?
2. Is our understanding of the customer (or whatever system we are trying to improve) correct or are we basing our decisions on the wrong assumptions? If so, what do we need to learn?
3. Do we have a clear picture of where we are going and what we want to achieve and how that is aligned with the goals of the organization? If not, how do we course correct or make our progress towards our goals clearer?
There you have it: the retrospective and the 3 dimensions of agile.