Just collecting information together from various official sources on the beta...
Source: https://www.youtube.com/watch?v=Sz5aeV-G7DE
The beta where we see "the game come together as a whole."
The alpha is where FD test different aspects of the game in "near final form," not the beta.
Braben also stated "We will take our time" and "release it when it's right" and do a "prolonged... gamma." "The purpose is to get the game good" before release.
Source: http://us2.campaign-archive2.com/?u=dcbf6b86b4b0c7d1c21b73b1e&id=94e38570c6&e=3e8d3662df
"Our subsequent Beta phase will follow on from the Alpha, and begins as the game starts to work as a coherent whole, and multiple functions of the game can be tested together. Again this will be a flexible process as we take and respond to feedback from the Beta testers."
Edit:
(Reasons from Braben on why vertical slice is a problematic way of doing things):
https://forums.frontier.co.uk/showthread.php?t=56618&page=2&p=968851&viewfull=1#post968851
Source: https://www.youtube.com/watch?v=Sz5aeV-G7DE
The beta where we see "the game come together as a whole."
The alpha is where FD test different aspects of the game in "near final form," not the beta.
Braben also stated "We will take our time" and "release it when it's right" and do a "prolonged... gamma." "The purpose is to get the game good" before release.
Source: http://us2.campaign-archive2.com/?u=dcbf6b86b4b0c7d1c21b73b1e&id=94e38570c6&e=3e8d3662df
"Our subsequent Beta phase will follow on from the Alpha, and begins as the game starts to work as a coherent whole, and multiple functions of the game can be tested together. Again this will be a flexible process as we take and respond to feedback from the Beta testers."
Edit:
(Reasons from Braben on why vertical slice is a problematic way of doing things):
https://forums.frontier.co.uk/showthread.php?t=56618&page=2&p=968851&viewfull=1#post968851
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