There are two aspects of the open which must be considered.
1. Yesterday
2. The premium
Consideration of yesterday.
I check out about 32 items. I call it a preflight check. By knowing what is going on in terms of "how the market works", you get a thorough context. By filling in the blanks on the sheet, I have to look to where to get the value, do the calc's and write, with a ball point, the value entry after entry which brings me right up to preopen housekeeping.
There is also the day's upcoming new information in the form of standard reports, etc. I have quantification of their effect on what I trade and it moslty relates to the cascading levels and how many will occur as the IB close out accounts. The best and most significant cascading was 27FEB a while back. reading the stalls was intersting but most of all reading the DOM's level of imbalance and lack of orders was fantastic as a statement. I camtasia'ed the whole nine yards and did a voice over for the archives.
The Premium.
Information provided by the interrelationship of the cash and the index is priceless. The premium is calculated and its directional offset is in itself a wonderful indicator.
The considerations include:
1. How long it is out of whack during the open.
2. The damping mode (3) of how the vanishing point is reached
Then you come to "reading the premium" after this synchronization ends the random walk and chaos theory applications.
3. Volatility compression and expansion begin to play as a record of smart money leading the herd.
4. Drift enters the picture and it drives a lot of bots and algos
5. Leading indications of high velocity trader trends
6. Sustaining indications of trends.
7. Strength of trends.
8. Trend ends and trend reversals
9. Non trending
10. IB's taking small traders out of the market as they blow out (cascading).
For reporting and planned news there is another series of reads, mostly known combos of the above.
Reading premium is one of the best leading indicators of price. It rates as high as the leading indications of price turns on the DOM which come into view 5 ticks off the BBID/BAsk pair. Ir rates with reading pair shifts on the OTR tick charts or reading PRV on volume Gaussians of leading markets of the market where price is traded.