Actually this is something I've been working on for the last few months. The general concept you're describing I refer to as "1's Clusters". In other words when you do see 1's, are they rolling out as singles, doubles, triples, etc. I find this to be much more useful than whether 1's in total are above or below average. Ellis, I think mathematically you are correct. If you want to do an SAP chart for 1's clusters I think the following values would work: single: 1 point double: 2 points triple: 4 points quadruple: 8 points etc, etc,.... Also you can certainly keep track of SAP 1's clusters and regular SAP events on the same score sheet. You can keep track of P/B results and over all score in the middle. You can track traditional SAP events to the right of P/B results (just as always). Track SAP 1's clusters to the left of P/B results. With 1's clusters any time you have 2 in a row straight after a confirmed 1, you know your cluster has ended and you can record it in your chart.