More progress could be made towards a deal on the staging of the independence referendum.
Talks are taking place between Scottish Secretary Michael Moore and Deputy First Minister Nicola Sturgeon.
Ms Sturgeon was handed responsibility for the referendum campaign in last week's Scottish cabinet reshuffle.
The latest talks follow on from a meeting she had with Scotland Office Minister David Mundell last Thursday which was described as "constructive" and "productive".
Speaking ahead of this latest round of discussions, Ms Sturgeon said: "I'm glad that Michael Moore has accepted my invitation to meet this week, following the productive talks I had last Thursday with David Mundell.
"I am looking forward to another positive discussion, which will help pave the way for a meeting between the First Minister and Prime Minister to conclude the referendum negotiations. We can then move on to debating the issues and persuading people to vote Yes to an independent Scotland."
Mr Moore said: "I believe it is essential to sort out the referendum process so that we can move on to the real debate about Scotland's future."
The Scottish Secretary added: "I hope Nicola Sturgeon's appointment and the mood music coming from the Scottish Government are a sign that we can make real progress in these referendum talks. I believe we can reach an agreement on an independence referendum that will be legal, fair and decisive."
He continued: "There are a number of areas we will be covering in our discussions.
"One of these will be the importance we attach to the referendum being a single question on independence. I have made it clear that we believe it is essential that the referendum has one question. The meeting with Nicola Sturgeon will give me an opportunity to better understand what the attitude of the Scottish Government is to a single-question referendum."