diff --git a/engine/policy.go b/engine/policy.go
deleted file mode 100644
index 7a80be9877..0000000000
--- a/engine/policy.go
+++ /dev/null
@@ -1,9 +0,0 @@
-package engine
-
-import (
-	types "github.com/nirmata/kube-policy/pkg/apis/policy/v1alpha1"
-)
-
-type policyInterface interface {
-	Apply(policy types.Policy, kind string, resource string, resourceRaw []byte) []byte, 
-}
diff --git a/pkg/engine/policy.go b/pkg/engine/policy.go
new file mode 100644
index 0000000000..6a42b4f573
--- /dev/null
+++ b/pkg/engine/policy.go
@@ -0,0 +1,13 @@
+package engine
+
+import (
+	types "github.com/nirmata/kube-policy/pkg/apis/policy/v1alpha1"
+	"github.com/nirmata/kube-policy/pkg/violation"
+	"github.com/nirmata/kube-policy/webhooks"
+)
+
+type policyInterface interface {
+	ApplySingle(policy types.Policy, resourceRaw []byte) (webhooks.PatchBytes, violation.Violations, error)
+
+	ApplyRegex(policy types.Policy) (webhooks.PatchBytes, violation.Violations, error)
+}
diff --git a/violation/violation.go b/pkg/violation/violation.go
similarity index 100%
rename from violation/violation.go
rename to pkg/violation/violation.go