It's a addon designed for raid leader, to arrange the cooldowns of raid member, for certain purpose
Like healing chains and/or interrupt chains

It can set up groups from raid members, then set up sequences from groups
Each sequence will show cooldown of selected spells of selected player, and suggest the best group to call
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The main button is located under the minimap by default
Right-click drag to change the position
Use /rs to show/hide the main button
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How to set up:
Right click the main button to show options menu
Click the '+' button in the main list to add a new Sequence
Click the Sequence to open Sequence editor

In the Sequence editor, drag to change the order
Click the button to show Group editor

In the Group editor, current raid member will be listed automatically
It can also add custom member by clicking empty button
Click the listed player to add him into current Group
His aviliable spells will also be listed at the bottom of the page

Click the listed spell to add it into current Group
It can also add custom spell by clicking empty button
(Notice: the cooldown of custom spell has to be set manually in the custom spell page)

After setting up a Sequence, click the 'Save' button on top of the list, to save the changes
It can also reset to before changes by clicking 'Cancel" button
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How to use:
Left click the main button to show all Sequence windows
Click the top-left button to change display direction
Click the top-right button to close the Sequence window
Drag the title of the window to change position
Drag the left, right, and bottom edge of the window to change size

Left click a Group to announce it in "Raid" channel
Right click a Group to announce it in "Raid-Warning" channel

RaidSequence