What are the stages in conduct of inquiry?

What are the stages in conduct of inquiry?
Conduct of inquiry comprises the following main stages:
(a) Pre – hearing stage: From the appointment of IO PO till the
commencement of hearing. During this stage, the IO and PO examine the
documents received by them and ensure their correctness. Besides, the PO
prepares for the presentation of the case.
(b) Preliminary Hearing Stage: From the time the parties start appearing
before the IO, till the commencement of presentation of evidence. During this
stage CO is asked once again as to whether the charges are admitted,
inspection of documents take place, CO presents the list of documents and
oral witnesses required for the purpose of defence
(c) Regular hearing stage: during this stage, evidence is produced by the
parties.
(d) Post hearing stage: during this stage, the PO and the CO submit their
written briefs to the IO and the IO submits his/her report to the Disciplinary
Authority.