Thank you for your question.
We have a great article with a detailed explanation of each license type (section Full Users) See link: http://usermanual.clarizen.com/#1-5-1-license-types-explained
You may also find this article helpful: http://usermanual.clarizen.com/#1-5-editions-and-licensing There is a table that highlights the main features available per license type.
For further clarification, we suggest you register for one of our daily Q&A webinars, see the link-> http://www.clarizen.com/live-demo-europe.html These are great resources for free consulting with our Customer Success Managers and visual answers to your questions. We will be happy to explain it in detail.
All the best,