I'm looking at building some sort of web based form that will allow users to send manually captured data to PI. We have looked at PI Manual Logger but the users want something that is more of a spreadsheet type format instead of one value entry at a time. I'm considering building something that would either use the PI AF SDK or PI Web services to send data back to PI so the users can do trending and analysis on the data. What is the recommended approach? Should I look at one or the other technology or something else?