The best replacement for grounded theory is phenomenology.

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★★★★★  phenomenology
★★★  case study
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★★  ipa
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★  qualitative research
★  scientific method
★  interpretative phenomenological analysis
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Speaking about grounded theory, one probably shouldn't forget about thematic analysis.

Other search terms related to grounded theory and their ratings are:
★★★★★ thematic analysis
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