diff --git a/src/model/models.rs b/src/model/models.rs
new file mode 100644
index 0000000..c9fd331
--- /dev/null
+++ b/src/model/models.rs
@@ -0,0 +1,13 @@
+#[repr(usize)]
+#[derive(Clone)]
+pub enum HammingMode {
+    Encrypt = 4,
+    Decrypt = 7,
+}
+
+pub struct EventHandler<F, C> {
+    pub(crate) component: C,
+    pub(crate) callback: F,
+}
+
+pub type SchemeCharacteristics = (f64, f64, f64, f64, f64, f64);