Section Three - 15 minute charts
In this section we move to the 15 minute timeframes and once again all these examples are from the MT4 platform.
Here the comparative nature of volume across sessions becomes less of an issue, other than when we are at the crossover itself. For example, when we move from the Far East and Asia into the London session, we do have to be careful in making  any comparative judgements between the two.
There is a workaround here, which is to have enough of the chart displayed so we can compare the volume at the start of the London session with the start of the prior day’s London session. This gives us our benchmark, and so we are comparing volume in the same session. As the first few candles build we can then look back and compare volume in the same session. In addition, another way to deal with this issue is we can step down to a faster timeframe, and use this as a quick reference guide to how volume is building on our fifteen minute chart as the session unfolds.