FACTBOX - What happens next in Zimbabwe after deal?

HARARE (Reuters) - President Robert Mugabe and opposition leader Morgan Tsvangirai agreed a power-sharing deal on Thursday to help end Zimbabwe's post-election power struggle, the MDC leader and a senior government source said.

Here is what is likely to happen next:

HOW WILL MUGABE AND TSVANGIRAI MOVE FORWARD?

- Mugabe and Tsvangirai are expected to form a new cabinet, including opposition figures who have been arrested by Mugabe's government several times since the MDC emerged nine years ago as the biggest threat to ZANU-PF's hold on power.

HOW WILL THE DEAL BE SIGNED?

- South African President Thabo Mbeki, who has been the regional mediator in the talks, could invite regional leaders to witness either a symbolic signing ceremony or inauguration of Zimbabwe's new unity government.

WILL WESTERN POWERS GIVE THEIR BLESSINGS?

- World powers, including the United States and Zimbabwe's former colonial master Britain, are likely to hold back immediate endorsement of the power-sharing deal until they see the details and how it will work in practice. If they determine a new government is democratic, Western countries are expected to consider major investment and aid packages.

HOW WILL REGIONAL POWERS SUPPORT THE SETTLEMENT?