Beyond the criteria that apply to computer-based diagnostics there are some aspects that concern especially internet-administered diagnostics. Basically, internet-based instruments should be self explainable, forgery-proof, hardware-independent, plugin-ready and accessible. This means in detail:

Self explainable
As internet-based instruments are mostly administered openly, that means uncontrolled, it is very important that they are self explainable. Basically, this means that the test provides interactive examples on which the candidate can familiarize himself/herself with the tasks of the respective instrument and on which he/she gets feedback about the way he/she dealt with the examples. The explanations for the examples should be detailed as much as possible as, in internet-based tests, there is normally no possibility to contact the test administrator if questions occur.

Forgery-proof
As already mentioned, the administration of internet-based instruments is often uncontrolled. Therefore, it should be ensured that the test is forgery-proof. That means that there should preferably not exist a model answer that could support the candidate to complete the tasks fast and correctly. In internet-based tests this can easily be ensured by generating the test dynamically at runtime. For this, it is almost impossible that the same test is generated twice.

Hardware independent
The problem of many internet-based instruments is that they are often optimized for a certain computer system (certain conditions: screen resolution, proportions) and that they are presented blurred or grainy on other computers. This can be avoided by vectorized item material which optimally adapts to monitor conditions and thus no effects due to the used hardware and internet connection occur.

Plugin-ready
Regarding internet-based instruments it is important that a seamless integration into existing application management, assessment or HR systems (e.g. SAP, Peoplesoft, Oracle) is possible. It can thereby be guaranteed that all participant data stays within the enterprise and that the security of data is ensured.

Accessible
Each internet-based instrument should be accessible according to the regulations for users with disabilities. This contains for instance that other input assistance devices besides the mouse (e. g. touch screens, touch pads, keyboard, specific input assistances for motor limited persons) as well as reading assistance devices (e.g. computer-internal loupe, magnifier) and other assistance can be used to complete the instruments.