diff --git a/lib/interactor.rb b/lib/interactor.rb
index 2423630..69edce0 100644
--- a/lib/interactor.rb
+++ b/lib/interactor.rb
@@ -140,7 +140,7 @@ def run
   # Raises Interactor::Failure if the context is failed.
   def run!
     with_hooks do
-      call
+      call(*arguments_for_call)
       context.called!(self)
     end
   rescue
@@ -163,4 +163,32 @@ def call
   # Returns nothing.
   def rollback
   end
+
+  private
+
+  # Internal: Determine what arguments (if any) should be passed to the "call"
+  # instance method when invoking an Interactor. The "call" instance method may
+  # accept any combination of positional and keyword arguments. This method
+  # will extract values from the context in order to populate those arguments
+  # based on their names.
+  #
+  # Returns an Array of arguments to be applied as an argument list.
+  def arguments_for_call
+    positional_arguments, keyword_arguments = [], {}
+    available_context_keys = context.to_h.keys
+
+    method(:call).parameters.each do |(type, name)|
+      next unless available_context_keys.include?(name)
+
+      case type
+      when :req, :opt
+        positional_arguments << context[name]
+      when :keyreq, :key
+        keyword_arguments[name] = context[name]
+      end
+    end
+
+    positional_arguments << keyword_arguments if keyword_arguments.any?
+    positional_arguments
+  end
 end
diff --git a/spec/interactor_spec.rb b/spec/interactor_spec.rb
index 05eefdf..2153bfc 100644
--- a/spec/interactor_spec.rb
+++ b/spec/interactor_spec.rb
@@ -1,3 +1,213 @@
 describe Interactor do
   include_examples :lint
+
+  describe "#call" do
+    let(:interactor) { Class.new.send(:include, described_class) }
+
+    context "positional arguments" do
+      it "accepts required positional arguments" do
+        interactor.class_eval do
+          def call(foo)
+            context.output = foo
+          end
+        end
+
+        result = interactor.call(foo: "baz", hello: "world")
+
+        expect(result.output).to eq("baz")
+      end
+
+      it "accepts optional positional arguments" do
+        interactor.class_eval do
+          def call(foo = "bar")
+            context.output = foo
+          end
+        end
+
+        result = interactor.call(foo: "baz", hello: "world")
+
+        expect(result.output).to eq("baz")
+      end
+
+      it "assigns absent positional arguments" do
+        interactor.class_eval do
+          def call(foo = "bar")
+            context.output = foo
+          end
+        end
+
+        result = interactor.call(hello: "world")
+
+        expect(result.output).to eq("bar")
+      end
+
+      it "raises an error for missing positional arguments" do
+        interactor.class_eval do
+          def call(foo)
+            context.output = foo
+          end
+        end
+
+        expect { interactor.call(hello: "world") }.to raise_error(ArgumentError)
+      end
+    end
+
+    context "keyword arguments" do
+      it "accepts required keyword arguments" do
+        interactor.class_eval do
+          def call(foo:)
+            context.output = foo
+          end
+        end
+
+        result = interactor.call(foo: "baz", hello: "world")
+
+        expect(result.output).to eq("baz")
+      end
+
+      it "accepts optional keyword arguments" do
+        interactor.class_eval do
+          def call(foo: "bar")
+            context.output = foo
+          end
+        end
+
+        result = interactor.call(foo: "baz", hello: "world")
+
+        expect(result.output).to eq("baz")
+      end
+
+      it "assigns absent keyword arguments" do
+        interactor.class_eval do
+          def call(foo: "bar")
+            context.output = foo
+          end
+        end
+
+        result = interactor.call(hello: "world")
+
+        expect(result.output).to eq("bar")
+      end
+
+      it "raises an error for missing keyword arguments" do
+        interactor.class_eval do
+          def call(foo:)
+            context.output = foo
+          end
+        end
+
+        expect { interactor.call(hello: "world") }.to raise_error(ArgumentError)
+      end
+    end
+
+    context "combination arguments" do
+      it "accepts required positional with required keyword arguments" do
+        interactor.class_eval do
+          def call(foo, hello:)
+            context.output = [foo, hello]
+          end
+        end
+
+        result = interactor.call(foo: "baz", hello: "world")
+
+        expect(result.output).to eq(["baz", "world"])
+      end
+
+      it "accepts required positional with optional keyword arguments" do
+        interactor.class_eval do
+          def call(foo, hello: "there")
+            context.output = [foo, hello]
+          end
+        end
+
+        result = interactor.call(foo: "baz", hello: "world")
+
+        expect(result.output).to eq(["baz", "world"])
+      end
+
+      it "accepts required positional and assigns absent keyword arguments" do
+        interactor.class_eval do
+          def call(foo, hello: "there")
+            context.output = [foo, hello]
+          end
+        end
+
+        result = interactor.call(foo: "baz")
+
+        expect(result.output).to eq(["baz", "there"])
+      end
+
+      it "accepts optional positional with required keyword arguments" do
+        interactor.class_eval do
+          def call(foo = "bar", hello:)
+            context.output = [foo, hello]
+          end
+        end
+
+        result = interactor.call(foo: "baz", hello: "world")
+
+        expect(result.output).to eq(["baz", "world"])
+      end
+
+      it "accepts optional positional with optional keyword arguments" do
+        interactor.class_eval do
+          def call(foo = "bar", hello: "there")
+            context.output = [foo, hello]
+          end
+        end
+
+        result = interactor.call(foo: "baz", hello: "world")
+
+        expect(result.output).to eq(["baz", "world"])
+      end
+
+      it "accepts optional positional and assigns absent keyword arguments" do
+        interactor.class_eval do
+          def call(foo = "bar", hello: "there")
+            context.output = [foo, hello]
+          end
+        end
+
+        result = interactor.call(foo: "baz")
+
+        expect(result.output).to eq(["baz", "there"])
+      end
+
+      it "assigns absent positional and accepts required keyword arguments" do
+        interactor.class_eval do
+          def call(foo = "bar", hello:)
+            context.output = [foo, hello]
+          end
+        end
+
+        result = interactor.call(hello: "world")
+
+        expect(result.output).to eq(["bar", "world"])
+      end
+
+      it "assigns absent positional and accepts optional keyword arguments" do
+        interactor.class_eval do
+          def call(foo = "bar", hello: "there")
+            context.output = [foo, hello]
+          end
+        end
+
+        result = interactor.call(hello: "world")
+
+        expect(result.output).to eq(["bar", "world"])
+      end
+
+      it "assigns absent positional and absent keyword arguments" do
+        interactor.class_eval do
+          def call(foo = "bar", hello: "there")
+            context.output = [foo, hello]
+          end
+        end
+
+        result = interactor.call
+
+        expect(result.output).to eq(["bar", "there"])
+      end
+    end
+  end
 end