"The meeting of Political Dialogue Consensus Committee (PDCC) representing different political parties, agreed to change the Constituent Assembly's calendar so as to resolve disagreements among them regarding the disputed issues," said Nepali Congress (NC) general secretary Prakash Man Singh.
Forms of governance, number of federal units and model of state restructuring are the key issues on which political parties are yet to forge a consensus.
They, however, reiterated their resolve to base the document on federal, democratic and republican principles.
"As we need more time to hold discussion on the vexed issues of the constitution, we have decided to ask the Constituent Assembly to amend the working schedule without affecting the January 22 deadline of promulgating the new constitution," he said.
The political parties decided to amend the working schedule after holding meeting of the PDCC at the recommendation of the three major parties and 28 fringe parties.