McDonald's erroneously used a focus group to convince themselves to roll out the Arch Deluxe.

It was indeed popular with a small group of loyal customers, but that was not the future target of the company.

It is vital to evaluate if your initial success depends on unscalable ingredients.

For example, it would be a mistake to use ample resources to hire the best preschool teachers, then expect that their positive results would be replicated when the curricula they use was scal...

There are five vital signs to consider when thinking about whether an idea, policy or product can scale.

1. Watch out for false positives.
2. Consider if you're misjudging the representativeness of the demographic.
3. Understand the cons...

In 1996, McDonald's believed that the Arch Deluxe hamburger was the solution to their growth that had flatlined. The burger appealed to a new, older demographic. Extensive focus groups showed adults liked the burger, so the company invested a lot of money in rolling the burger out nationwide.

An idea may look promising at first, but when it is rigorously tested, the results may fail to replicate.

If you find a good result in one area, it doesn't mean you should roll it out everywhere. First replicate it in that area to ensure it's a true result, then try it out in other markets....

Identify if your product has economies of scale.

When you scale your operation, does it get cheaper to produce it? For example, building a factory costs money up front, and the first couple of devices will reflect that. But, over time, it will become cheaper to produce beca...