Evolution of Minimum Viable Product

The keyword here is customers

If you are building something for others, which you expect to make money from, then you should probably be thinking about a Minimum Sellable Product - what is the most basic product that a very specific target user or group of target users, will pay for. Or at the very least the target users must be willing (and ideally eager) to use the product “for real” (eg. for work or daily personal use)

This means your MVP or MSP, could very well be just a spreadsheet, or a basic document, as long as it’s clearly targeting specific people who want/need to use it

Minimum viable product used to mean, "What do we build that hooks a customer immediately?". It is about getting them engaged and learning from their engagement to then build features onto the MVP.

The first iphone for example, was very barebones: slow EDGE internet, only a few apps, very low powered device. But people loved it because the things it did well it did very well- for instance it was a beautiful touchscreen that always remained silky smooth. The feeling of sliding something and having it stay under your finger really tricks your brain in a way nothing did before, and is so good you forget the weaknesses and missing features.