On a project I worked on, this was an early draft of the campaign mission flow I designed based on the Story we had (mostly redacted for NDA). The edict from the Game Director and the Game Design team was that the players had to have some autonomy to decide what they wanted to do and that the story couldn't be completely linear. The story also needed to advance across three areas, with each area becoming more difficult to challenge the players as they progressed.

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As can be seen in the image above, I found areas in the story where certain missions could be done in any order and created branches that the players could choose to do. In order to progress, the players would still have to complete the other branches but they would have some autonomy to decide which order they completed these missions in. This was also in conjunction with an Open-world design that would give the players more choice in deciding if they wanted to go and collect items, gather resources or unlock optional characters between missions.

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The story needing to span over three distinct areas allowed us in the Narrative team to apply it to a three-act structure and raise the stakes along with the Gameplay difficulty.