diff --git a/lib/extensions/Array.js b/lib/extensions/Array.js
index 474e8f5..efdb332 100644
--- a/lib/extensions/Array.js
+++ b/lib/extensions/Array.js
@@ -11,20 +11,24 @@ var ArraySchema = module.exports = Schema.extensions.ArraySchema = Schema.extend
 
   validate : function(instance) {
     // Instance must be an instance of Array
-    if (!(instance instanceof Array)) return false
+    if (!(instance instanceof Array)) throw new Error('not an array')
 
     // Checking length
     if (this.min === this.max) {
-      if (instance.length !== this.min) return false
+      if (instance.length !== this.min) throw new Error('array does not contain enought entries (' + instance.length + ' instead of ' + this.min)
 
     } else {
-      if (this.min > 0        && instance.length < this.min) return false
-      if (this.max < Infinity && instance.length > this.max) return false
+      if (this.min > 0        && instance.length < this.min) throw new Error('array does not contain enought entries (' + instance.length + ' instead of ' + this.min)
+      if (this.max < Infinity && instance.length > this.max) throw new Error('array does contain too many entries (' + instance.length + ' instead of ' + this.min)
     }
 
     // Checking conformance to the given item schema
     for (var i = 0; i < instance.length; i++) {
-      if (!this.itemSchema.validate(instance[i])) return false;
+      try {
+		  this.itemSchema.validate(instance[i])
+	  } catch(e) {
+		  throw new Error('array contains invalid entry at ' + i + ' --> ' + e)
+	  }
     }
 
     return true
diff --git a/lib/extensions/Boolean.js b/lib/extensions/Boolean.js
index 7b79652..aa669d0 100644
--- a/lib/extensions/Boolean.js
+++ b/lib/extensions/Boolean.js
@@ -2,7 +2,10 @@ var Schema = require('../BaseSchema')
 
 var BooleanSchema = module.exports = Schema.extensions.BooleanSchema =  new Schema.extend({
   validate : function(instance) {
-    return Object(instance) instanceof Boolean
+    if (!Object(instance) instanceof Boolean)
+		throw new Error('not a Boolean')
+
+	return true
   },
 
   toJSON : function() {
diff --git a/lib/extensions/Number.js b/lib/extensions/Number.js
index 69a8210..9f485bc 100644
--- a/lib/extensions/Number.js
+++ b/lib/extensions/Number.js
@@ -47,12 +47,19 @@ var NumberSchema = module.exports = Schema.extensions.NumberSchema = Schema.exte
   publicFunctions : [ 'min', 'above', 'max', 'below', 'step' ],
 
   validate : function(instance) {
-    return (Object(instance) instanceof Number) &&
-           (this.exclusiveMinimum ? instance >  this.minimum
-                                  : instance >= this.minimum) &&
-           (this.exclusiveMaximum ? instance <  this.maximum
-                                  : instance <= this.maximum) &&
-           (this.divisibleBy === 0 || instance % this.divisibleBy === 0)
+    if (! Object(instance) instanceof Number)
+	  throw new Error('not a Number')
+	if (!(this.exclusiveMinimum ? instance >  this.minimum
+                                  : instance >= this.minimum))
+		throw new Error(instance + ' does not exceed minimum ' + this.minimum)
+    if (! (this.exclusiveMaximum ? instance <  this.maximum
+                                  : instance <= this.maximum))
+		throw new Error(instance + ' exceeds maximum ' + this.maximum)
+
+	if (!(this.divisibleBy === 0 || instance % this.divisibleBy === 0))
+		  throw new Error('not an array')
+
+	return true
   },
 
   toJSON : function() {
diff --git a/lib/patterns/anything.js b/lib/patterns/anything.js
index 1adbf92..3495b17 100644
--- a/lib/patterns/anything.js
+++ b/lib/patterns/anything.js
@@ -2,7 +2,9 @@ var Schema = require('../BaseSchema')
 
 var AnythingSchema = module.exports = Schema.patterns.AnythingSchema = Schema.extend({
   validate : function(instance) {
-    return instance != null
+     if (instance == null)
+		 throw new Error('may not be null')
+	 return true
   },
 
   toJSON : function() {
diff --git a/lib/patterns/class.js b/lib/patterns/class.js
index 494a06a..4c69266 100644
--- a/lib/patterns/class.js
+++ b/lib/patterns/class.js
@@ -6,7 +6,9 @@ var ClassSchema = module.exports = Schema.patterns.ClassSchema = Schema.extend({
   },
 
   validate : function(instance) {
-    return instance instanceof this.constructor
+    if (instance instanceof this.constructor)
+		throw new Error('not a class constructor')
+	return true;
   }
 })
 
diff --git a/lib/patterns/equality.js b/lib/patterns/equality.js
index ed33ef4..b0ab622 100644
--- a/lib/patterns/equality.js
+++ b/lib/patterns/equality.js
@@ -26,7 +26,9 @@ var EqualitySchema = module.exports = Schema.patterns.EqualitySchema = Schema.ex
   },
 
   validate : function(instance) {
-    return equal(instance, this.object)
+    if (! equal(instance, this.object))
+		throw new Error(instance + ' not equal to ' + this.object.toString() )
+	return true;
   },
 
   toJSON : function() {
diff --git a/lib/patterns/nothing.js b/lib/patterns/nothing.js
index 4966243..79f88a4 100644
--- a/lib/patterns/nothing.js
+++ b/lib/patterns/nothing.js
@@ -2,7 +2,9 @@ var Schema = require('../BaseSchema')
 
 var NothingSchema = module.exports = Schema.patterns.NothingSchema = Schema.extend({
   validate : function(instance) {
-    return instance == null
+	  if (instance != null)
+		  throw new Error('must be null')
+	  return true
   },
 
   toJSON : function() {
diff --git a/lib/patterns/object.js b/lib/patterns/object.js
index 38cfcf3..e82a01c 100644
--- a/lib/patterns/object.js
+++ b/lib/patterns/object.js
@@ -23,14 +23,18 @@ var ObjectSchema = module.exports = Schema.patterns.ObjectSchema = Schema.extend
   validate : function(instance) {
     var self = this
 
-    if (instance == null) return false
+    if (instance == null) throw new Error('No data')
 
     // Simple string properties
-    var stringPropsValid = Object.keys(this.stringProps).every(function(key) {
-      return (self.stringProps[key].min === 0 && !(key in instance)) ||
-             (self.stringProps[key].value.validate(instance[key]))
+    Object.keys(this.stringProps).every(function(key) {
+      if (self.stringProps[key].min === 0 && !(key in instance))
+		  throw new Error('key "' + key + '" is obligated but missing');
+	  try {
+		  self.stringProps[key].value.validate(instance[key])
+	  } catch(e) {
+		  throw new Error('Parse error for key "' + key + '" --> ' + e);
+	  }
     })
-    if (!stringPropsValid) return false
 
     // If there are no RegExp and other validator, that's all
     if (!this.regexpProps.length && this.other === anything) return true
@@ -41,17 +45,25 @@ var ObjectSchema = module.exports = Schema.patterns.ObjectSchema = Schema.extend
 
       // Checking the key against every key regexps
       checked = false
-      var regexpPropsValid = Object.keys(this.regexpProps).every(function(key) {
-        return (!self.regexpProps[key].key.test(key) ||
-                ((checked = true) && self.regexpProps[key].value.validate(instance[key]))
-               )
+      Object.keys(this.regexpProps).every(function(key) {
+		  if (!self.regexpProps[key].key.test(key)) return
+		  checked = true
+		  try {
+			  self.regexpProps[key].value.validate(instance[key])
+		  } catch(e) {
+			  throw new Error('Parse error for regexp in key "' + key + '" --> ' + e);
+		  }
       })
-      if (!regexpPropsValid) return false
 
       // If the key is not matched by regexps and by simple string checks
       // then check it against this.other
-      if (!checked && !(key in this.stringProps) && !this.other.validate(instance[key])) return false
-
+		if (!checked && !(key in this.stringProps)) {
+			try {
+			 this.other.validate(instance[key])
+		  } catch(e) {
+			  throw new Error('Parse error for key "' + key + '" --> ' + e);
+		  }
+		}
     }
 
     // If all checks passed, the instance conforms to the schema
diff --git a/lib/patterns/or.js b/lib/patterns/or.js
index a351f2f..eb0c080 100644
--- a/lib/patterns/or.js
+++ b/lib/patterns/or.js
@@ -8,7 +8,7 @@ var OrSchema = module.exports = Schema.patterns.OrSchema = Schema.extend({
 
   validate : function(instance) {
     return this.schemas.some(function(sch) {
-      return sch.validate(instance)
+      return sch.validate(instance) //TODO: add a name of the schema to the thrown error?
     })
   },
 
diff --git a/lib/patterns/reference.js b/lib/patterns/reference.js
index c2c41c2..677d930 100644
--- a/lib/patterns/reference.js
+++ b/lib/patterns/reference.js
@@ -6,7 +6,9 @@ var ReferenceSchema = module.exports = Schema.patterns.ReferenceSchema = Schema.
   },
 
   validate : function(instance) {
-    return instance === this.value
+    if (instance !== this.value)
+		throw new Error(instance + ' is not the same as ' + this.value)
+	return true;
   },
 
   toJSON : function() {
diff --git a/lib/patterns/regexp.js b/lib/patterns/regexp.js
index 7d8ae96..606f497 100644
--- a/lib/patterns/regexp.js
+++ b/lib/patterns/regexp.js
@@ -6,7 +6,13 @@ var RegexpSchema = module.exports = Schema.patterns.RegexpSchema = Schema.extend
   },
 
   validate : function(instance) {
-    return Object(instance) instanceof String && (!this.regexp || this.regexp.test(instance))
+	  if (! Object(instance) instanceof String) {
+		  throw new Error('not a String')
+	  }
+	  if (this.regexp && !this.regexp.test(instance))
+		  throw new Error('"' + instance + '" does not match pattern "' + this.regexp +'"')
+
+	  return true;
   },
 
   toJSON : function() {