diff --git a/core/runner.go b/core/runner.go
index ac9618b..3089a24 100644
--- a/core/runner.go
+++ b/core/runner.go
@@ -24,7 +24,7 @@ func (r *RadRunner) Run() error {
 	pflag.CommandLine.ParseErrorsWhitelist.UnknownFlags = true
 
 	pflag.Usage = func() {
-		r.RunUsageExit()
+		r.RunUsage()
 	}
 
 	r.globalFlags = CreateAndRegisterGlobalFlags()
@@ -106,6 +106,7 @@ func (r *RadRunner) Run() error {
 	pflag.CommandLine.ParseErrorsWhitelist.UnknownFlags = false
 
 	// todo apparently this is not recommended, I should be using flagsets? I THINK I DO, FOR TESTS?
+	//  RAD-67 will prevent double-error print (see https://github.com/spf13/pflag/issues/352)
 	pflag.Parse()
 
 	posArgsIndex := 0
diff --git a/core/testing/args_test.go b/core/testing/args_test.go
index 64c01ed..2dd20d5 100644
--- a/core/testing/args_test.go
+++ b/core/testing/args_test.go
@@ -1,6 +1,8 @@
 package testing
 
-import "testing"
+import (
+	"testing"
+)
 
 const (
 	setupArgRsl = `
@@ -312,3 +314,64 @@ print(name, isTall)
 	assertOnlyOutput(t, stdOutBuffer, expected)
 	resetTestState()
 }
+
+func TestArgs_MissingArgsPrintsUsageAndReturnsError(t *testing.T) {
+	rsl := `
+args:
+	name string
+	age int
+`
+	setupAndRunCode(t, rsl, "alice", "--NO-COLOR")
+	expected := `Missing required arguments: [age]
+Usage:
+  test <name> <age>
+
+Script args:
+      --name string   
+      --age int       
+
+` + globalFlagHelp
+	assertError(t, 1, expected)
+	resetTestState()
+}
+
+func TestArgs_TooManyArgsPrintsUsageAndReturnsError(t *testing.T) {
+	rsl := `
+args:
+	name string
+	age int
+`
+	setupAndRunCode(t, rsl, "alice", "2", "3", "--NO-COLOR")
+	expected := `Too many positional arguments. Unused: [3]
+Usage:
+  test <name> <age>
+
+Script args:
+      --name string   
+      --age int       
+
+` + globalFlagHelp
+	assertError(t, 1, expected)
+	resetTestState()
+}
+
+// todo RAD-67 - pflag currently ExitsOnError, I think that's why this test doesn't work
+//func TestArgs_InvalidFlagPrintsUsageAndReturnsError(t *testing.T) {
+//	rsl := `
+//args:
+//	name string
+//	age int
+//`
+//	fmt.Println("hi")
+//	setupAndRunCode(t, rsl, "alice", "2", "-s", "--NO-COLOR")
+//	expected := `Usage:
+//  test <name> <age>
+//
+//Script args:
+//      --name string
+//      --age int
+//
+//` + globalFlagHelp
+//	assertError(t, 1, expected)
+//	resetTestState()
+//}