Some systems work very well as cooperative endeavors. For example, anyone can go and edit Wikipedia. This gives it a very low barrier for entry, letting anyone provide their knowledge and wisdom to others, by assuming that everyone is well intentioned.
However, open access does have its issues, especially with its pseudo- anonymity. Wikipedia often suffers from data "vandalism", and some editors have even introduced malware and malicious links. To combat this situation, some Wikipedia editors are tagged as administrators, which allows them to protect pages or block users that are dubious or behave inappropriately. Standard users cannot do this.
In a similar fashion, ServiceNow has different levels of access, which gives some people more privileges than others. For example, some users may be able to approve orders for a new tablet or mobile phone while others may be able to edit or update financial information. Controlling who can do what is incredibly important for an information...