If you wish, you can also allow your staff/volunteers to add their own qualifications into the system.
This is done via the 'Configuration' page, and is done on a group-by-group basis (eg. people from one group can be allowed to enter their own qualifications, whilst others in another group might not be allowed to).
To change this setting, go to the 'People' tab in the configuration page, and update 'People can add their own qualifications' area as needed. You can opt to only allow people to add certain types of skills & qualifications if you wish - eg. you might allow people to add their licences and any languages they might know, but not allow them to add other qualifications.
Your staff won't be able to add entirely new qualifications into the system by using this facility - only choose from the existing list of skills & qualifications which have already been entered.
Requiring Approval
Depending on your business requirements, you may wish to setup some of your skills or qualifications so they require approval from a manager when a staff member enters it themselves.
These restrictions are also applied to managers whom enter their own skills/qualifications - their own managers will need to review & approve the skills/qualifications which they've entered for themselves (eg. from their own manager or system-administrator).
For certain skills/qualifications, you may want to further restrict whom (of the people whom manage your staff/volunteers) can approve certain qualifications. In this instance, you just need to enter the names of those people into the "Restrict approvals to" box, when editing a qualification (eg. a Driving Licence, or a first-aid certificate).
This will mean that only those managers whom are listed will be able to approve those certain qualifications (provided they have access to manage those people already).