diff --git a/pom.xml b/pom.xml
index 96fa279532d5e496d716ae6d31a3dd27315e2afb..cb11bcd655ac67fd8087e84f65ba2c3d8bebf8b0 100644
--- a/pom.xml
+++ b/pom.xml
@@ -51,6 +51,12 @@
 			<version>0.8-SNAPSHOT</version>
 		</dependency>
 		  -->
+		<dependency>
+			<groupId>javax.inject</groupId>
+			<artifactId>javax.inject</artifactId>
+			<version>1</version>
+			<scope>provided</scope>
+		</dependency>
 		<!-- unit tests -->
 		<dependency>
 			<groupId>junit</groupId>
diff --git a/src/main/java/org/aktin/Configurable.java b/src/main/java/org/aktin/Configurable.java
deleted file mode 100644
index 50768951a0e8666667d099d489acc19057a795cb..0000000000000000000000000000000000000000
--- a/src/main/java/org/aktin/Configurable.java
+++ /dev/null
@@ -1,27 +0,0 @@
-package org.aktin;
-
-import java.lang.reflect.Method;
-import java.util.LinkedList;
-import java.util.List;
-
-/**
- * Marker interface to allow automatic injection of configuration preferences
- * 
- * @author R.W.Majeed
- *
- */
-public interface Configurable {
-
-	public default List<String> getPreferences(){
-		List<String> prefs = new LinkedList<>();
-		Method[] methods = getClass().getDeclaredMethods();
-		for( int i=0; i<methods.length; i++ ){
-			Preference pref = methods[i].getAnnotation(Preference.class);
-			if( pref != null ){
-				prefs.add(pref.id());
-			}
-		}
-		return prefs;
-	}
-
-}
diff --git a/src/main/java/org/aktin/Module.java b/src/main/java/org/aktin/Module.java
index 0d5185159991577e048a219c645184d78f7586f4..681987b442a5e51811f6910c0f9d864d8b0623bc 100644
--- a/src/main/java/org/aktin/Module.java
+++ b/src/main/java/org/aktin/Module.java
@@ -1,6 +1,6 @@
 package org.aktin;
 
-public abstract class Module implements Configurable{
+public abstract class Module {
 
 	public String getVersion(){
 		return getClass().getPackage().getImplementationVersion();
diff --git a/src/main/java/org/aktin/Preference.java b/src/main/java/org/aktin/Preference.java
index 296c9bfabd9c523c3aacb9aeed5e19b2de09f270..f1b4093b9a60232f61c30766df0e11d8602870ce 100644
--- a/src/main/java/org/aktin/Preference.java
+++ b/src/main/java/org/aktin/Preference.java
@@ -2,19 +2,25 @@ package org.aktin;
 
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Target;
+
+import javax.inject.Qualifier;
 
 /**
- * AKTIN preference. If the annotation is used, also implement the {@link Configurable} interface.
+ * AKTIN preference. Can be used to inject preference values into any class.
+ * The preferences can not be changed during runtime.
  * 
- * TODO add annotation processor to verify at compile time that each preference id is unique and method types are void(SingleArg)
  *
  * @author R.W.Majeed
  *
  */
+
+@Qualifier
 @Retention(RetentionPolicy.RUNTIME)
+@Target({ ElementType.METHOD, ElementType.FIELD, ElementType.CONSTRUCTOR })
 public @interface Preference {
-
-	String id();
-	String example() default "";
-	
+	// no default meaning a value is mandatory
+	//@Nonbinding
+	String name();
 }
diff --git a/src/main/java/org/aktin/Preferences.java b/src/main/java/org/aktin/Preferences.java
index 1d0ccc270c9cbc6439d35ab1fd7830ea9f58905f..3e0aa7e63dc6c5fbe308fb724ac0d493ab4116b1 100644
--- a/src/main/java/org/aktin/Preferences.java
+++ b/src/main/java/org/aktin/Preferences.java
@@ -1,11 +1,10 @@
 package org.aktin;
 
-import java.lang.annotation.Retention;
-import java.lang.annotation.RetentionPolicy;
+import java.util.Set;
 
-@Retention(RetentionPolicy.RUNTIME)
-public @interface Preferences {
+public interface Preferences {
 
-	String group();
-	// TODO add Class<?> validator() to validate preferences
-}
\ No newline at end of file
+	String get(String key);
+
+	Set<String> keySet();
+}
diff --git a/src/main/java/org/aktin/prefs/Preference.java b/src/main/java/org/aktin/prefs/Preference.java
deleted file mode 100644
index 7bd7c239eb45cab15c590e066bfeadecab02fdd6..0000000000000000000000000000000000000000
--- a/src/main/java/org/aktin/prefs/Preference.java
+++ /dev/null
@@ -1,63 +0,0 @@
-package org.aktin.prefs;
-
-/**
- * All preferences can be read/written by the API (system).
- * Some preferences might be readable/writable publicly
- * e.g. by an authenticated user.
- * 
- * @author R.W.Majeed
- *
- * @param <T> value type
- */
-public interface Preference<T> {
-	Preferences getPreferences();
-	/**
-	 * Get the preference value data type
-	 * @return data type for the value
-	 */
-	Class<T> getType();
-	/**
-	 * Get the preference value
-	 * @return value
-	 */
-	T getValue();
-	/**
-	 * Get the preference name / key
-	 * @return key name
-	 */
-	String getKey();
-	
-	boolean isPublicWritable();
-	boolean isPublicReadable();
-	
-	/**
-	 * Perform a public update by user
-	 * @param user user name
-	 * @param value value
-	 */
-	public void setValue(T value, String user);
-	
-	/**
-	 * Set the value by the system user
-	 * @param value value
-	 */
-	public void setValue(T value);
-	
-	/**
-	 * Set the value to the given string representation. The value
-	 * is changed by the system user.
-	 * @param value string representing the value
-	 * @throws IllegalArgumentException if the string conversion fails
-	 */
-	public void setValueString(String value) throws IllegalArgumentException;
-
-	/**
-	 * Set the value to the given string representation. The specified
-	 * user name is used to perform the change.
-	 * 
-	 * @param value string value
-	 * @param user user name
-	 * @throws IllegalArgumentException if string conversion fails
-	 */
-	public void setValueString(String value, String user) throws IllegalArgumentException;
-}
diff --git a/src/main/java/org/aktin/prefs/Preferences.java b/src/main/java/org/aktin/prefs/Preferences.java
deleted file mode 100644
index d6566c2ec53cb018f2c62c82a61df331fd06b9b3..0000000000000000000000000000000000000000
--- a/src/main/java/org/aktin/prefs/Preferences.java
+++ /dev/null
@@ -1,28 +0,0 @@
-package org.aktin.prefs;
-
-import java.io.IOException;
-/**
- * API for AKTIN preferences.
- * <p>
- * To access preferences, use a CDI injection
- * in your class (e.g with {@code javax.inject.Inject} 
- * annotation.
- * 
- * @author R.W.Majeed
- *
- */
-public interface Preferences {
-	public String getString(String key);
-	public Integer getInteger(String key);
-
-	public void putString(String key, String value);
-	public void putInteger(String key, Integer value);
-	
-	public Preference<?> get(String key);
-	/**
-	 * Write the changed preferences to the underlying
-	 * storage (e.g. database)
-	 * @throws IOException flush error
-	 */
-	public void flush() throws IOException;
-}
diff --git a/src/main/java/org/aktin/prefs/Validator.java b/src/main/java/org/aktin/prefs/Validator.java
deleted file mode 100644
index 1fb71e5d67ae992fc83a7a997d0ad2fddb28fdf2..0000000000000000000000000000000000000000
--- a/src/main/java/org/aktin/prefs/Validator.java
+++ /dev/null
@@ -1,12 +0,0 @@
-package org.aktin.prefs;
-
-/**
- * Validates preference settings. 
- * A validator may work for one or more preferences, 
- * e.g for R executable (one preference) or email server settings (multiple)
- * @author R.W.Majeed
- *
- */
-public interface Validator {
-
-}