A foundational question in product design is what features to add to a new product.  The more features we add, the more complicated and expensive the product becomes.

There is no uniform formula that will allow us to find the optimal number of features for our product. However, a three-step...

The core set of features is critical to your product launch. This is often the most challenging part of product design.

• Apply the Pareto principle: 80% of the value comes from 20% of features. Define the one job that will add the most value to your target audience.

The first product release allows you to learn how users react to the added features and understand what engages and drives them.

• Track features people use most often. Most users will use a particular set of features. Therefore, it's vital to improve the user experience...

Use small changes to adjust your product: It is faster and less expensive, and it is easier to track the effect of those changes.

Key metrics to measure:

• Behavioural - how easy is your product to use?: Task Success, Task Time, Error rate.