Considering 'consider'
First of all it is necessary to consider about unemployment. Unemployment is considered as a serious problem.
This one is a quickie for Indonesians who feel a strong urge to insert tentang after consider and sebagai after the passive considered.
First of all it is necessary to consider unemployment.
Unemployment is considered (to be) a serious problem.
Next time you use consider/considered, consider not using tentang/sebagai!