diff --git a/interleaver/interfaces.go b/interleaver/interfaces.go
new file mode 100644
index 0000000..dd2c1b5
--- /dev/null
+++ b/interleaver/interfaces.go
@@ -0,0 +1,25 @@
+// Copyright 2014 by Sascha L. Teichmann
+// Use of this source code is governed by the MIT license
+// that can be found in the LICENSE file.
+
+package main
+
+import "bitbucket.org/s_l_teichmann/mtredisalize/common"
+
+type (
+	Block struct {
+		Coord common.Coord
+		Data  []byte
+	}
+
+	BlocKProducer interface {
+		Next() (Block, error)
+		HasNext() bool
+		Close() error
+	}
+
+	BlockConsumer interface {
+		Consume(Block)
+		Close() error
+	}
+)