diff --git a/kyo-core/shared/src/main/scala/kyo/edits.scala b/kyo-core/shared/src/main/scala/kyo/edits.scala
new file mode 100644
index 000000000..a90226974
--- /dev/null
+++ b/kyo-core/shared/src/main/scala/kyo/edits.scala
@@ -0,0 +1,45 @@
+package kyo
+
+import kyo.sums._
+import kyo.ios._
+
+object ttt extends KyoApp {
+  import edits._
+
+  case class Address(street: String)
+  case class Person(name: String, age: Int, address: Address)
+
+  def run =
+    Edits(Person("test", 10, Address("rua")))(_[Address]("address").set(Address("rua 2")))
+}
+
+object edits {
+
+  private val sums = Sums[Map[Edit[Any], Any]]
+
+  class Edit[T](path: List[String], value: T) {
+    def apply[U](id: String): Edit[U] =
+      new Edit[U](id :: path, value.asInstanceOf[U])
+    def get: T > Edits =
+      sums.get.map(_.getOrElse(this.asInstanceOf[Edit[Any]], value).asInstanceOf[T])
+    def set(v: T): Unit > Edits =
+      sums.add(Map(this.asInstanceOf[Edit[Any]] -> v)).unit
+
+    override def toString = s"Edit(${path.reverse.mkString(".")})"
+  }
+
+  type Edits >: Edits.Effects <: Edits.Effects
+
+  object Edits {
+
+    type Effects = Sums[Map[Edit[Any], Any]]
+
+    def apply[T, S](v: T)(f: Edit[T] => Unit > (Edits with S)): T > S =
+      sums.run(f(new Edit(Nil, v))).map {
+        case ((), edits) =>
+          println(edits)
+          v
+      }
+  }
+
+}
diff --git a/kyo-core/shared/src/main/scala/kyo/sums.scala b/kyo-core/shared/src/main/scala/kyo/sums.scala
index 8240a89e8..715697c06 100644
--- a/kyo-core/shared/src/main/scala/kyo/sums.scala
+++ b/kyo-core/shared/src/main/scala/kyo/sums.scala
@@ -102,12 +102,13 @@ object sums {
         def init              = _init
         def add(v1: V, v2: V) = _add(v1, v2)
       }
-    implicit val intSummer: Summer[Int]         = Summer(0)(_ + _)
-    implicit val longSummer: Summer[Long]       = Summer(0L)(_ + _)
-    implicit val doubleSummer: Summer[Double]   = Summer(0d)(_ + _)
-    implicit val floatSummer: Summer[Float]     = Summer(0f)(_ + _)
-    implicit val stringSummer: Summer[String]   = Summer("")(_ + _)
-    implicit def listSummer[T]: Summer[List[T]] = Summer(List.empty[T])(_ ++ _)
-    implicit def setSummer[T]: Summer[Set[T]]   = Summer(Set.empty[T])(_ ++ _)
+    implicit val intSummer: Summer[Int]             = Summer(0)(_ + _)
+    implicit val longSummer: Summer[Long]           = Summer(0L)(_ + _)
+    implicit val doubleSummer: Summer[Double]       = Summer(0d)(_ + _)
+    implicit val floatSummer: Summer[Float]         = Summer(0f)(_ + _)
+    implicit val stringSummer: Summer[String]       = Summer("")(_ + _)
+    implicit def listSummer[T]: Summer[List[T]]     = Summer(List.empty[T])(_ ++ _)
+    implicit def setSummer[T]: Summer[Set[T]]       = Summer(Set.empty[T])(_ ++ _)
+    implicit def mapSummer[T, U]: Summer[Map[T, U]] = Summer(Map.empty[T, U])(_ ++ _)
   }
 }