The Holy Ordos operate with a simple yet complex rank structure; here is presented a simplified version as applies to the outlying Segmentum Obscurus sectors and regions:

Inquisitors: Inquisitors are the true lords and masters of the Holy Ordos. They rank far and above even the most renowned and experienced of interrogators. They are empowered to act in His name, without any restrictions - save those imposed on them by their peers, and the God-Emperor of Mankind himself. All Inquisitors are - in theory at least - equal in power and authority. Particularly powerful and politically well-connected Inquisitors are, however, often given the honorific rank if Lord Inquisitors(sometimes High Inquisitors). The sector head of one of the three Ordos are given the title Master, as is the chief of sub-sector operations, while the master of a sector Conclave is titulated Grandmaster.

Initiates: Initiates are acolytes who have proved themselves repeatedly and been given a special rank to go along with their increased obligations. There are two main subdivisions within the ranks of the initiates - Explicators and Interrogators. Explicators are either field officers or long-serving specialists; this is the highest rank most members of the Inquisition can hope to achieve. Interrogators are Inquisitors-in-training or apprentice Inquisitors if you will. Many are empowered to act with the authority of their master if he is absent - within certain limits. Its fairly common to divide the ranks into junior/senior and some Inquisitors also employ other honorific ranks to bestow on valued servants.

Acolytes: Acolytes is a catchall people who have not only been recruited to work for the Inquisition, but empowered to act on behalf of the Holy Ordos. They are usually trusted and highly skilled people who have served in an Inquisitor's cadre for some time. They are given an acolyte's 'Rosette' to signify their rank (it also acts as an ID-tag and pass-card for restricted Inquisition areas) and have the moral and factual authority to act in His name. Acolytes who fail in the service or abuse their authority will quickly be stripped of rank and terminated. Most Acolytes are referred to as Agents, although some Conclaves or Cadres use other titles.

Operatives/spies/informants/contacts/etc.: These are people who work for the Inquisition in some capacity, but who are not in any way part of that august organization and thus lack the moral and factual authority of acolytes. Many might not even know that they are affiliated with the Holy Ordos, just that they work for some shadowy organization (there are many of those) that they may or may not suspect is part of the Imperium of Man.