Thanks for the links .. very interesting, and complex ! I found a good source at Wikipedia (of course) as well as StockCharts. e.g. MACD http://stockcharts.com/school/doku.php?id=chart_school:technical_indicators:moving_average_conve EMA http://stockcharts.com/school/doku.php?id=chart_school:technical_indicators:moving_averages I obviously know how the calculate EMAs, WMAs etc. etc. , but just want to ensure that the definitions I will use will be the same as those used widely by the financial community ! Thx all the same !