diff --git a/app/models/enhancer.rb b/app/models/enhancer.rb
index b21099bf..0a8dd07e 100644
--- a/app/models/enhancer.rb
+++ b/app/models/enhancer.rb
@@ -1,7 +1,7 @@
 class Enhancer
   attr_accessor :enhanced_query
 
-  QUERY_PARAMS = %i[q citation contentType contributors fundingInformation identifiers locations subjects title queryMode].freeze
+  QUERY_PARAMS = %i[q citation contentType contributors fundingInformation identifiers locations subjects title queryMode queryTuning].freeze
   FILTER_PARAMS = %i[accessToFilesFilter contentTypeFilter contributorsFilter formatFilter languagesFilter
                      literaryFormFilter placesFilter sourceFilter subjectsFilter].freeze
   GEO_PARAMS = %i[geoboxMinLongitude geoboxMinLatitude geoboxMaxLongitude geoboxMaxLatitude geodistanceLatitude
diff --git a/app/models/query_builder.rb b/app/models/query_builder.rb
index 76491ca0..1ed90e82 100644
--- a/app/models/query_builder.rb
+++ b/app/models/query_builder.rb
@@ -72,6 +72,17 @@ def evaluate_query_mode(enhanced_query)
 
     # Validate against allow list
     mode = 'keyword' unless VALID_QUERY_MODES.include?(mode)
+
+    # Override mode based on numeric tuning parameter if specific values present
+    if enhanced_query[:queryTuning]
+      Rails.logger.debug 'Query Tuning parameter present - checking for override'
+      Rails.logger.debug "queryTuning is #{enhanced_query[:queryTuning]}"
+      mode = 'keyword' if enhanced_query[:queryTuning].to_f == 0.0
+      mode = 'hybrid' if (enhanced_query[:queryTuning].to_f - 0.5).abs < Float::EPSILON
+      mode = 'semantic' if (enhanced_query[:queryTuning].to_f - 1.0).abs < Float::EPSILON
+      Rails.logger.debug "Query mode set to #{mode}"
+    end
+
     @query['queryMode'] = mode
   end
 end