Wyckoff trading method, page-59

1- potential stopping volume is a primary indicator of strength, so it is to be considered pretty strong.
However, it is probably third in line of strength amongst the VSA indicators, with Bag Holding as #1, and the various forms of climactic action as equal #2's, then stopping volume.
Personally I try to simplify things, and generally try to lump all the primary indicators of strength together, and then all of the secondary (confirming) indicators together as well (the various types of tests, shakeouts, and no supply).
In this way I simplify all those named bars into primary indicators of strength, and primary indicators of weakness. Then the secondary (confirming) indicators of strength, and the secondary (confirming) indicators of weakness.
Just four in all (for the most part).....although there are are also a few other exceptions which need to be added to this as well.

2- The volume on my chart shows combined ASX and Chi-X volume (eg- total Australian Volume for the day), and on the last upbar the combined volume was 7,991,200, compared to the 21/12 which was 5,611,100, and the 22/12 was 4,869,500.
So the last upbar had substantially higher volume than the 21st or 22nd of December.
It is probably excessive in some way, but whether it will be damaging or not depends on the intentions behind it, and I can only speculate on that.
Perhaps I could look 'inside' that bar at some intraday timeframes to see if any telltale signs were left behind.
My 'gut feeling' is that supply was strongly absorbed on that last bar, leaving a supply vacuum in preparation for a spike in price (a potential PnD perhaps).

3- OK generally we like to see enough volume to support the price movements higher. There are no exact measurements though, it is just a personal judgement.
So steadily rising volumes on a steadily rising price, taking into consideration of what price is moving through to the left (congestion or potential resistance will generally require higher volume).
And Finally, when price is trending higher....every now and then it puts in a low volume downbar (a test for supply in a rising market).....at that time the steadily rising volume resets, and begins steadily rising again from the level of the test, as price also rises (this reset is important, as otherwise you will expect volumes to always be rising, and would eventually need to be massive to support price....and this is not the case).

cheers