How do I let board members see only the items assigned to them?

Short answer: Make those users Restricted members of the board. A restricted member sees only the items assigned to them, and can edit or view transitions only while they're the current assignee.

Why it happens

• Admins and members see every item on the board.
• Restricted members see only their assigned items, can't open shared views, and can create only private views.

How to fix it

1. Open the board and click Manage > Share.
2. Add the users, or change an existing member's role with Make a restricted member.
3. Assign items to them. They see each item while it's assigned to them.

See members and roles in a board.

To control who sees an item as it moves:

1. Use separate statuses for each team, and change the item's assignee as it reaches each status.

To keep other people informed about a specific item:

1. Open the item, click Watchers > Add watchers, and pick board members. An item can have one assignee and up to 49 watchers. See watching an item.