How to work a diagonal shoulder. Part 1 - Back piece

In this DROPS Video, Part 1 of 3 videos, we show how to work a diagonal shoulder on the back piece. We have already cast on 17 stitches, purled 1 row from WS and insert 1 marker on the inside of the 3 outermost stitches in each side. Then we show how to increase after written description in the pattern how to get the stitches to turn towards the right or towards the left.
We show 2 rows from the RS and 2 rows from the WS with increases. Then we work back and forth without increases. Put the stitches on a thread or a stitch holder when you got the right measurement, cut the thread. See Video Part 2 on how to pick-up stitches in the shoulder seam to the front pieces.
We use the yarn DROPS Snow in the video.
This video has NO SOUND - You must read a pattern to get the correct numbers of stitches, increases and rows. You’ll find a pattern with this technique is used by clicking here: www.garnstudio... DROPS catalog 235-3
How to work a diagonal shoulder. Part 2 - Front pieces:
www.garnstudio...
How to work the front pieces together where you have a diagonal shoulder. Part 3:
www.garnstudio...
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[@lucianaleonardo7973]

I would like to know if you measure the shoulders to determine how many initial stitches you will put on the needle? and I would also like to know how you decide how many points you will increase. thanks