The most important thing to get right is the approach, the strategy
How you look at a problem is the single most important factor to get right. In business and government terms, you start with a goal. A busines goal is defined as a doing thing. It given to you by the board, the minister, a senior executive.
It is based upon a verb e.g. We want to improve the way we do something.
How you view the problem, i.e. the approach, is critical when it comes to solving that problem. If you take the wrong approach, or use the wrong technique, you are very likely to fail