Problems due to test automation

What type of problems can arise due to test automation?

Test maintenance: Automation test bed need to be updated as continuous process inline with any changes in application. Otherwise the test script would be break quite often and it wont provide the desired result. Debugging the test script is always a major concern. It requires technically skilled tester to write the automation test scripts.
Testing automated activities
Tests that run on several different hardware or software platforms and configurations................
Scripting techniques for test automation
Scripting techniques available for test automation - Data-driven, Modularity-driven, Keyword-driven, Hybrid testing, Model-based testing
Data-driven automation
DDT is testing the same set of functionalities with different set of data. In DDT, the scripts are programmed in structured manner...............
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Nagesh 05-1-2012