diff --git a/core/js/src/main/scala/works/iterative/core/Logging.scala b/core/js/src/main/scala/works/iterative/core/Logging.scala
deleted file mode 100644
index f836d7f..0000000
--- a/core/js/src/main/scala/works/iterative/core/Logging.scala
+++ /dev/null
@@ -1,18 +0,0 @@
-package works.iterative.core
-
-/** Logging app service
-  *
-  * This typeclass will be implemented by a JS app to provide logging.
-  */
-trait Logging[A]:
-  def log(level: LogLevel, msg: String, t: Option[Throwable]): Unit
-  def logError(msg: String, t: Throwable): Unit = logError(msg, Some(t))
-  def logError(msg: String, t: Option[Throwable]): Unit =
-    log(LogLevel.Error, msg, t)
-  def logWarning(msg: String): Unit = log(LogLevel.Warning, msg, None)
-  def logInfo(msg: String): Unit = log(LogLevel.Info, msg, None)
-  def logDebug(msg: String): Unit = log(LogLevel.Debug, msg, None)
-  def logTrace(msg: String): Unit = log(LogLevel.Trace, msg, None)
-
-enum LogLevel:
-  case Error, Warning, Info, Debug, Trace

diff --git a/core/js/src/main/scala/works/iterative/core/Logging.scala b/core/js/src/main/scala/works/iterative/core/Logging.scala
deleted file mode 100644
index f836d7f..0000000
--- a/core/js/src/main/scala/works/iterative/core/Logging.scala
+++ /dev/null
@@ -1,18 +0,0 @@
-package works.iterative.core
-
-/** Logging app service
-  *
-  * This typeclass will be implemented by a JS app to provide logging.
-  */
-trait Logging[A]:
-  def log(level: LogLevel, msg: String, t: Option[Throwable]): Unit
-  def logError(msg: String, t: Throwable): Unit = logError(msg, Some(t))
-  def logError(msg: String, t: Option[Throwable]): Unit =
-    log(LogLevel.Error, msg, t)
-  def logWarning(msg: String): Unit = log(LogLevel.Warning, msg, None)
-  def logInfo(msg: String): Unit = log(LogLevel.Info, msg, None)
-  def logDebug(msg: String): Unit = log(LogLevel.Debug, msg, None)
-  def logTrace(msg: String): Unit = log(LogLevel.Trace, msg, None)
-
-enum LogLevel:
-  case Error, Warning, Info, Debug, Trace
diff --git a/core/shared/src/main/scala/works/iterative/core/UserMessage.scala b/core/shared/src/main/scala/works/iterative/core/UserMessage.scala
index 67bf96f..37bda09 100644
--- a/core/shared/src/main/scala/works/iterative/core/UserMessage.scala
+++ b/core/shared/src/main/scala/works/iterative/core/UserMessage.scala
@@ -4,7 +4,9 @@
 // Type-wise naive solution for specifying user messages.
 // A mechanism that will check the message for correct formatting and validate parameters is needed
 // TODO: make UserMessage serializable
-case class UserMessage(id: MessageId, args: Any*)
+case class UserMessage(id: MessageId, args: Any*):
+  override def toString(): String =
+    s"${id}[${args.mkString(", ")}]"
 
 object UserMessage:
   given Conversion[MessageId, UserMessage] with

diff --git a/core/js/src/main/scala/works/iterative/core/Logging.scala b/core/js/src/main/scala/works/iterative/core/Logging.scala
deleted file mode 100644
index f836d7f..0000000
--- a/core/js/src/main/scala/works/iterative/core/Logging.scala
+++ /dev/null
@@ -1,18 +0,0 @@
-package works.iterative.core
-
-/** Logging app service
-  *
-  * This typeclass will be implemented by a JS app to provide logging.
-  */
-trait Logging[A]:
-  def log(level: LogLevel, msg: String, t: Option[Throwable]): Unit
-  def logError(msg: String, t: Throwable): Unit = logError(msg, Some(t))
-  def logError(msg: String, t: Option[Throwable]): Unit =
-    log(LogLevel.Error, msg, t)
-  def logWarning(msg: String): Unit = log(LogLevel.Warning, msg, None)
-  def logInfo(msg: String): Unit = log(LogLevel.Info, msg, None)
-  def logDebug(msg: String): Unit = log(LogLevel.Debug, msg, None)
-  def logTrace(msg: String): Unit = log(LogLevel.Trace, msg, None)
-
-enum LogLevel:
-  case Error, Warning, Info, Debug, Trace
diff --git a/core/shared/src/main/scala/works/iterative/core/UserMessage.scala b/core/shared/src/main/scala/works/iterative/core/UserMessage.scala
index 67bf96f..37bda09 100644
--- a/core/shared/src/main/scala/works/iterative/core/UserMessage.scala
+++ b/core/shared/src/main/scala/works/iterative/core/UserMessage.scala
@@ -4,7 +4,9 @@
 // Type-wise naive solution for specifying user messages.
 // A mechanism that will check the message for correct formatting and validate parameters is needed
 // TODO: make UserMessage serializable
-case class UserMessage(id: MessageId, args: Any*)
+case class UserMessage(id: MessageId, args: Any*):
+  override def toString(): String =
+    s"${id}[${args.mkString(", ")}]"
 
 object UserMessage:
   given Conversion[MessageId, UserMessage] with
diff --git a/ui/shared/src/main/scala/works/iterative/ui/Module.scala b/ui/shared/src/main/scala/works/iterative/ui/Module.scala
index 6a44b4a..50bfa56 100644
--- a/ui/shared/src/main/scala/works/iterative/ui/Module.scala
+++ b/ui/shared/src/main/scala/works/iterative/ui/Module.scala
@@ -7,4 +7,5 @@
   def handle(action: Action, model: Model): (Model, Option[Effect])
   // Optionally define how to handle failures.
   // To be used by implementations to allow module to display error messages.
-  def handleFailure: PartialFunction[Throwable, Option[Action]]
+  def handleFailure: PartialFunction[Throwable, Option[Action]] =
+    PartialFunction.empty