There are around a hundred end users. There are challenges in the scalability due to accessing a large virtual HCM and retrieving data.

Essentially the scalability sometimes is a little bit difficult depending on how it needs to be applied in some scenarios. I have been working for very different companies from medium-sized to quite large — a few thousand users. Oftentimes only for groups of 50 plus users. Scalability is inherent in that scope and it can be done. The specific reasons and application of scaling may make it more or less challenging, but it can be done.  

I rate Microsoft Analytics Platform System a seven out of ten for scalability.

We have approximately five hundred users and I expect our usage to increase in two years' time.

In my case, the scalability is okay because I know how to work with the architecture and the design. I do not think many people would know that. If someone is coming from a wider experience base and thinks that just because they have worked with other solutions this will work easily, they may end up building something not scalable. So the issue of scalability is not really dependent on the product but is rather is the fault of the design engineer and their knowledge.