It’s usually not a good idea to mix all the things you came up with and run a one-big-experiment-for-everything
Inside the Process of Conversion Rate Optimization
RealtimeBoard Stories
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There is a case to be made for grouping multiple changes. They have the potential to lead to higher results, faster. Here is one such strategy: http://goodui.org/blog/the-best-shot-testing-strategy-the-fastest-way-to-higher-conversions/