Categories of Dhammanupassana (Satipatthana) What are the components, the categories (the dhammas)that have to be observed in dhammanupassana (the 4th field of satipatthana)?
The categories are:


5 hindrances
5 aggregates of clinging
6 internal and 6 external sense-bases
7 awakening-factors
4 noble truths


Sourced from: Mahā Sati’patthāna Sutta