Union Government
(1) Each House of Parliament may make its own rules for regulating its procedure and conduct of business, subject to the Constitution. (2) Until such rules are made, pre-Constitution rules and standing orders continue, with modifications by the Chairman or Speaker. (3) The President, after consulting the Chairman and Speaker, may make rules for joint sittings and inter-House communication. (4) At a joint sitting, the Speaker of the House of the People (or a designated substitute) presides.
Each House of Parliament sets its own detailed internal procedural rules (like how debates are structured, how questions are asked, committee processes, etc.) rather than having all these details fixed in the Constitution itself - giving Parliament flexibility to adapt its own working methods over time.
The detailed "Rules of Procedure and Conduct of Business" documents that govern day-to-day functioning of the Lok Sabha and Rajya Sabha - covering things like Question Hour, Zero Hour, and how bills are debated - are made under this article's authority, not written into the Constitution's text itself.