Integration of the Tasks Carried Out
The integration criterion should be considered from your (the worker's) point of view.
You are a self-employed person if the services you render are not part of the business's usual activities (for example, if you are an outside consultant).
As such, you can offer your services to more than one client.
You are an employee if you
- sell a business's products and sales are among the business's activities;
- earn income primarily by working for a single employer.