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--- en:create:filters [10.12.2014 14:00] – admin
+++ en:create:filters [18.01.2016 15:07] – [Filters and Conditional Questions] Update DE admin
@@ Line 2: / Line 2: @@
 Filters are needed if the questionnaire flow should be individually adjusted. The simplest use would be not to show a question - that you know from an earlier question - is irrelevant to the questionee.
+A warning in advance: Most project administrators that use SoSci Survey have never before written computer programming code. You'll learn some very basic knowledge about programming with PHP in this chapter. Don't worry: The first step is always the hardest. You'll see that it's not as hard as it may seem -- and you'll be awarded by a steep learning curve. Some little frustration, you may suffer, will be compensated by a even more happy aha!
+**Important:** For a better understanding, we recommend the chapther [[:en:create:php]].
+**Important:** Should a filter not work as it should, please take a look into [[:en:create:filter-solving]].
+**Important:** SoSci Survey saves all data from a respondent. If you allow a back button, the following situation may occur: A respondent answers question A, goes back, changes a filter question, and will not be presented question A any more in the subsequent questionnaire. The answers given to question A are still in the data record -- although the data tells that this respondent should not have seen question A.
+**Tip:** If you separate respondents into a control group and an experimental group ([[:en:create:questions:random]], [[:en:create:randomization]]) and present them different questionnaire pages, it may be useful to (early) use ''[[:en:create:functions:setpageorder]]'' instead of ''[[:en:create:functions:gotopage]]'': The earlier in the interview SoSci Survey knows that pages will be skipped, the better can it adapt the progress bar.
 ===== Example: Yes-No-Filters =====