Why do both houses have to be in session at the same time?

Answer 1

The article of Adjournment lays the ground rules for Congress to keep both houses within close proximity of each other. The reason for such a thing is to keep either house from passing legislation that the other would have to also pass to move it on to the president for signing, from being held up until the other could be in session. More for a means of expedience and legality that in cases of a call to war where both houses would have to pass the measure or fundamental aspects of keeping the government running both houses would be available at the same time to debate and vote on laws that need to be passed for the betterment of the nation.

Answer 2

It is called Congress so that means both houses and they need to be in session to get work done in legislation. If one was missing then they couldn't work together on something. Today congress has given up it's legislative power to the executive branch so they seem to do very little. The writers of the constitution wanted a mutual effort to compromise and communicate with each other in congress.

Answer 3

To allow members of congress to do their work without interference.

Answer 4

rdagre