diff --git a/baked_in.go b/baked_in.go
index 1fa65c2..464969c 100644
--- a/baked_in.go
+++ b/baked_in.go
@@ -9,7 +9,7 @@ import (
 
 var bakedInValidators = map[string]ValidationFunc{
 	"required": required,
-	"length":   length,
+	"len":      length,
 	"min":      min,
 	"max":      max,
 	"regex":    regex,
@@ -17,7 +17,16 @@ var bakedInValidators = map[string]ValidationFunc{
 
 func required(field interface{}, param string) bool {
 
-	return field != nil && field != reflect.Zero(reflect.TypeOf(field)).Interface()
+	st := reflect.ValueOf(field)
+
+	switch st.Kind() {
+
+	case reflect.Slice, reflect.Map, reflect.Array:
+		return field != nil && int64(st.Len()) > 0
+
+	default:
+		return field != nil && field != reflect.Zero(reflect.TypeOf(field)).Interface()
+	}
 }
 
 // length tests whether a variable's length is equal to a given
diff --git a/validator.go b/validator.go
index adbfeca..2664663 100644
--- a/validator.go
+++ b/validator.go
@@ -1,18 +1,26 @@
+/**
+ * Package validator
+ *
+ * MISC:
+ * - anonymous structs - they don't have names so expect the Struct name within StructValidationErrors to be blank
+ *
+ */
+
 package validator
 
 import (
 	"errors"
 	"fmt"
-	"log"
 	"reflect"
 	"strings"
 	"unicode"
 )
 
 const (
-	defaultTagName          = "validate"
-	omitempty        string = "omitempty"
-	validationErrMsg        = "Field validation for \"%s\" failed on the \"%s\" tag\n"
+	defaultTagName         = "validate"
+	omitempty              = "omitempty"
+	validationFieldErrMsg  = "Field validation for \"%s\" failed on the \"%s\" tag\n"
+	validationStructErrMsg = "Struct:%s\n"
 )
 
 // FieldValidationError contains a single fields validation error
@@ -24,29 +32,35 @@ type FieldValidationError struct {
 // This is intended for use in development + debugging and not intended to be a production error message.
 // it also allows FieldValidationError to be used as an Error interface
 func (e FieldValidationError) Error() string {
-	return fmt.Sprintf(validationErrMsg, e.Field, e.ErrorTag)
+	return fmt.Sprintf(validationFieldErrMsg, e.Field, e.ErrorTag)
 }
 
-// StructValidationErrors is a struct of errors for struct fields ( Excluding fields of type struct )
-// NOTE: if a field within a struct is a struct it's errors will not be contained within the current
-// StructValidationErrors but rather a new StructValidationErrors is created for each struct resulting in
-// a neat & tidy 2D flattened list of structs validation errors
+// StructValidationErrors is hierarchical list of field and struct errors
 type StructValidationErrors struct {
+	// Name of the Struct
 	Struct string
+	// Struct Field Errors
 	Errors map[string]*FieldValidationError
+	// Struct Fields of type struct and their errors
+	// key = Field Name of current struct, but internally Struct will be the actual struct name unless anonymous struct, it will be blank
+	StructErrors map[string]*StructValidationErrors
 }
 
 // This is intended for use in development + debugging and not intended to be a production error message.
 // it also allows StructValidationErrors to be used as an Error interface
 func (e StructValidationErrors) Error() string {
 
-	s := ""
+	s := fmt.Sprintf(validationStructErrMsg, e.Struct)
 
 	for _, err := range e.Errors {
-		s += fmt.Sprintf(validationErrMsg, err.Field, err.ErrorTag)
+		s += err.Error()
+	}
+
+	for _, sErr := range e.StructErrors {
+		s += sErr.Error()
 	}
 
-	return s
+	return fmt.Sprintf("%s\n\n", s)
 }
 
 // ValidationFunc that accepts the value of a field and parameter for use in validation (parameter not always used or needed)
@@ -113,22 +127,22 @@ func (v *Validator) AddFunction(key string, f ValidationFunc) error {
 }
 
 // ValidateStruct validates a struct and returns a struct containing the errors
-func ValidateStruct(s interface{}) map[string]*StructValidationErrors {
+func ValidateStruct(s interface{}) *StructValidationErrors {
 
 	return internalValidator.ValidateStruct(s)
 }
 
 // ValidateStruct validates a struct and returns a struct containing the errors
-func (v *Validator) ValidateStruct(s interface{}) map[string]*StructValidationErrors {
+func (v *Validator) ValidateStruct(s interface{}) *StructValidationErrors {
 
-	errorArray := map[string]*StructValidationErrors{}
 	structValue := reflect.ValueOf(s)
 	structType := reflect.TypeOf(s)
 	structName := structType.Name()
 
-	var currentStructError = &StructValidationErrors{
-		Struct: structName,
-		Errors: map[string]*FieldValidationError{},
+	validationErrors := &StructValidationErrors{
+		Struct:       structName,
+		Errors:       map[string]*FieldValidationError{},
+		StructErrors: map[string]*StructValidationErrors{},
 	}
 
 	if structValue.Kind() == reflect.Ptr && !structValue.IsNil() {
@@ -136,7 +150,7 @@ func (v *Validator) ValidateStruct(s interface{}) map[string]*StructValidationEr
 	}
 
 	if structValue.Kind() != reflect.Struct {
-		log.Fatal("interface passed for validation is not a struct")
+		panic("interface passed for validation is not a struct")
 	}
 
 	var numFields = structValue.NumField()
@@ -170,9 +184,7 @@ func (v *Validator) ValidateStruct(s interface{}) map[string]*StructValidationEr
 			}
 
 			if structErrors := v.ValidateStruct(valueField.Interface()); structErrors != nil {
-				for key, val := range structErrors {
-					errorArray[key] = val
-				}
+				validationErrors.StructErrors[typeField.Name] = structErrors
 				// free up memory map no longer needed
 				structErrors = nil
 			}
@@ -180,24 +192,18 @@ func (v *Validator) ValidateStruct(s interface{}) map[string]*StructValidationEr
 		default:
 
 			if fieldError := v.validateStructFieldByTag(valueField.Interface(), typeField.Name, tag); fieldError != nil {
-				currentStructError.Errors[fieldError.Field] = fieldError
+				validationErrors.Errors[fieldError.Field] = fieldError
 				// free up memory reference
 				fieldError = nil
 			}
 		}
 	}
 
-	if len(currentStructError.Errors) > 0 {
-		errorArray[currentStructError.Struct] = currentStructError
-		// free up memory
-		currentStructError = nil
-	}
-
-	if len(errorArray) == 0 {
+	if len(validationErrors.Errors) == 0 && len(validationErrors.StructErrors) == 0 {
 		return nil
 	}
 
-	return errorArray
+	return validationErrors
 }
 
 // ValidateFieldWithTag validates the given field by the given tag arguments
@@ -245,7 +251,7 @@ func (v *Validator) validateFieldByNameAndTag(f interface{}, name string, tag st
 	switch valueField.Kind() {
 
 	case reflect.Struct, reflect.Invalid:
-		log.Fatal("Invalid field passed to ValidateFieldWithTag")
+		panic("Invalid field passed to ValidateFieldWithTag")
 	}
 
 	valTags := strings.Split(tag, ",")
@@ -256,7 +262,7 @@ func (v *Validator) validateFieldByNameAndTag(f interface{}, name string, tag st
 		key := strings.Trim(vals[0], " ")
 
 		if len(key) == 0 {
-			log.Fatalf("Invalid validation tag on field %s", name)
+			panic(fmt.Sprintf("Invalid validation tag on field %s", name))
 		}
 
 		// OK to continue because we checked it's existance before getting into this loop
@@ -266,7 +272,7 @@ func (v *Validator) validateFieldByNameAndTag(f interface{}, name string, tag st
 
 		valFunc := v.validationFuncs[key]
 		if valFunc == nil {
-			log.Fatalf("Undefined validation function on field %s", name)
+			panic(fmt.Sprintf("Undefined validation function on field %s", name))
 		}
 
 		param := ""
diff --git a/validator_test.go b/validator_test.go
index 1010506..58375b4 100644
--- a/validator_test.go
+++ b/validator_test.go
@@ -5,53 +5,340 @@ import (
 	"testing"
 
 	"github.com/joeybloggs/go-validate-yourself"
+	. "gopkg.in/check.v1"
 )
 
-type UserDetails struct {
-	Address string `validate:"omitempty,length=6"`
+type SubTest struct {
+	Test string `validate:"required"`
 }
 
-type User struct {
-	FirstName string `validate:"required"`
-	Details   *UserDetails
+type TestString struct {
+	Required  string `validate:"required"`
+	Len       string `validate:"len=10"`
+	Min       string `validate:"min=1"`
+	Max       string `validate:"max=10"`
+	MinMax    string `validate:"min=1,max=10"`
+	OmitEmpty string `validate:"omitempty,min=1,max=10"`
+	Sub       *SubTest
+	SubIgnore *SubTest `validate:"-"`
+	Anonymous struct {
+		A string `validate:"required"`
+	}
+}
+
+type TestInt32 struct {
+	Required  int `validate:"required"`
+	Len       int `validate:"len=10"`
+	Min       int `validate:"min=1"`
+	Max       int `validate:"max=10"`
+	MinMax    int `validate:"min=1,max=10"`
+	OmitEmpty int `validate:"omitempty,min=1,max=10"`
+}
+
+type TestUint64 struct {
+	Required  uint64 `validate:"required"`
+	Len       uint64 `validate:"len=10"`
+	Min       uint64 `validate:"min=1"`
+	Max       uint64 `validate:"max=10"`
+	MinMax    uint64 `validate:"min=1,max=10"`
+	OmitEmpty uint64 `validate:"omitempty,min=1,max=10"`
+}
+
+type TestFloat64 struct {
+	Required  int64 `validate:"required"`
+	Len       int64 `validate:"len=10"`
+	Min       int64 `validate:"min=1"`
+	Max       int64 `validate:"max=10"`
+	MinMax    int64 `validate:"min=1,max=10"`
+	OmitEmpty int64 `validate:"omitempty,min=1,max=10"`
+}
+
+type TestSlice struct {
+	Required  []int `validate:"required"`
+	Len       []int `validate:"len=10"`
+	Min       []int `validate:"min=1"`
+	Max       []int `validate:"max=10"`
+	MinMax    []int `validate:"min=1,max=10"`
+	OmitEmpty []int `validate:"omitempty,min=1,max=10"`
+}
+
+func Test(t *testing.T) { TestingT(t) }
+
+type MySuite struct{}
+
+var _ = Suite(&MySuite{})
+
+func AssetStruct(s *validator.StructValidationErrors, structFieldName string, expectedStructName string, c *C) *validator.StructValidationErrors {
+
+	val, ok := s.StructErrors[structFieldName]
+	c.Assert(ok, Equals, true)
+	c.Assert(val, NotNil)
+	c.Assert(val.Struct, Equals, expectedStructName)
+
+	return val
 }
 
-func TestValidateStruct(t *testing.T) {
+func AssertFieldError(s *validator.StructValidationErrors, field string, expectedTag string, c *C) {
+
+	val, ok := s.Errors[field]
+	c.Assert(ok, Equals, true)
+	c.Assert(val, NotNil)
+	c.Assert(val.Field, Equals, field)
+	c.Assert(val.ErrorTag, Equals, expectedTag)
+}
+
+func (ms *MySuite) TestStructStringValidation(c *C) {
+
+	tSuccess := &TestString{
+		Required:  "Required",
+		Len:       "length==10",
+		Min:       "min=1",
+		Max:       "1234567890",
+		MinMax:    "12345",
+		OmitEmpty: "",
+		Sub: &SubTest{
+			Test: "1",
+		},
+		SubIgnore: &SubTest{
+			Test: "",
+		},
+		Anonymous: struct {
+			A string `validate:"required"`
+		}{
+			A: "1",
+		},
+	}
+
+	err := validator.ValidateStruct(tSuccess)
+	c.Assert(err, IsNil)
 
-	u := &User{
-		FirstName: "",
-		Details: &UserDetails{
-			"",
+	tFail := &TestString{
+		Required:  "",
+		Len:       "",
+		Min:       "",
+		Max:       "12345678901",
+		MinMax:    "",
+		OmitEmpty: "12345678901",
+		Sub: &SubTest{
+			Test: "",
 		},
+		Anonymous: struct {
+			A string `validate:"required"`
+		}{
+			A: "",
+		},
+	}
+
+	err = validator.ValidateStruct(tFail)
+
+	// Assert Top Level
+	c.Assert(err.Struct, Equals, "TestString")
+	c.Assert(len(err.Errors), Equals, 6)
+	c.Assert(len(err.StructErrors), Equals, 2)
+
+	// Assert Fields
+	AssertFieldError(err, "Required", "required", c)
+	AssertFieldError(err, "Len", "len", c)
+	AssertFieldError(err, "Min", "min", c)
+	AssertFieldError(err, "Max", "max", c)
+	AssertFieldError(err, "MinMax", "min", c)
+	AssertFieldError(err, "OmitEmpty", "max", c)
+
+	// Assert Anonymous embedded struct
+	AssetStruct(err, "Anonymous", "", c)
+
+	// Assert SubTest embedded struct
+	val := AssetStruct(err, "Sub", "SubTest", c)
+	c.Assert(len(val.Errors), Equals, 1)
+	c.Assert(len(val.StructErrors), Equals, 0)
+
+	AssertFieldError(val, "Test", "required", c)
+}
+
+func (ms *MySuite) TestStructInt32Validation(c *C) {
+
+	tSuccess := &TestInt32{
+		Required:  1,
+		Len:       10,
+		Min:       1,
+		Max:       10,
+		MinMax:    5,
+		OmitEmpty: 0,
+	}
+
+	err := validator.ValidateStruct(tSuccess)
+	c.Assert(err, IsNil)
+
+	tFail := &TestInt32{
+		Required:  0,
+		Len:       11,
+		Min:       -1,
+		Max:       11,
+		MinMax:    -1,
+		OmitEmpty: 11,
+	}
+
+	err = validator.ValidateStruct(tFail)
+
+	// Assert Top Level
+	c.Assert(err.Struct, Equals, "TestInt32")
+	c.Assert(len(err.Errors), Equals, 6)
+	c.Assert(len(err.StructErrors), Equals, 0)
+
+	// Assert Fields
+	AssertFieldError(err, "Required", "required", c)
+	AssertFieldError(err, "Len", "len", c)
+	AssertFieldError(err, "Min", "min", c)
+	AssertFieldError(err, "Max", "max", c)
+	AssertFieldError(err, "MinMax", "min", c)
+	AssertFieldError(err, "OmitEmpty", "max", c)
+}
+
+func (ms *MySuite) TestStructUint64Validation(c *C) {
+
+	tSuccess := &TestUint64{
+		Required:  1,
+		Len:       10,
+		Min:       1,
+		Max:       10,
+		MinMax:    5,
+		OmitEmpty: 0,
+	}
+
+	err := validator.ValidateStruct(tSuccess)
+	c.Assert(err, IsNil)
+
+	tFail := &TestUint64{
+		Required:  0,
+		Len:       11,
+		Min:       0,
+		Max:       11,
+		MinMax:    0,
+		OmitEmpty: 11,
+	}
+
+	err = validator.ValidateStruct(tFail)
+
+	// Assert Top Level
+	c.Assert(err.Struct, Equals, "TestUint64")
+	c.Assert(len(err.Errors), Equals, 6)
+	c.Assert(len(err.StructErrors), Equals, 0)
+
+	// Assert Fields
+	AssertFieldError(err, "Required", "required", c)
+	AssertFieldError(err, "Len", "len", c)
+	AssertFieldError(err, "Min", "min", c)
+	AssertFieldError(err, "Max", "max", c)
+	AssertFieldError(err, "MinMax", "min", c)
+	AssertFieldError(err, "OmitEmpty", "max", c)
+}
+
+func (ms *MySuite) TestStructFloat64Validation(c *C) {
+
+	tSuccess := &TestFloat64{
+		Required:  1,
+		Len:       10,
+		Min:       1,
+		Max:       10,
+		MinMax:    5,
+		OmitEmpty: 0,
+	}
+
+	err := validator.ValidateStruct(tSuccess)
+	c.Assert(err, IsNil)
+
+	tFail := &TestFloat64{
+		Required:  0,
+		Len:       11,
+		Min:       0,
+		Max:       11,
+		MinMax:    0,
+		OmitEmpty: 11,
+	}
+
+	err = validator.ValidateStruct(tFail)
+
+	// Assert Top Level
+	c.Assert(err.Struct, Equals, "TestFloat64")
+	c.Assert(len(err.Errors), Equals, 6)
+	c.Assert(len(err.StructErrors), Equals, 0)
+
+	// Assert Fields
+	AssertFieldError(err, "Required", "required", c)
+	AssertFieldError(err, "Len", "len", c)
+	AssertFieldError(err, "Min", "min", c)
+	AssertFieldError(err, "Max", "max", c)
+	AssertFieldError(err, "MinMax", "min", c)
+	AssertFieldError(err, "OmitEmpty", "max", c)
+}
+
+func (ms *MySuite) TestStructSliceValidation(c *C) {
+
+	tSuccess := &TestSlice{
+		Required:  []int{1},
+		Len:       []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 0},
+		Min:       []int{1, 2},
+		Max:       []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 0},
+		MinMax:    []int{1, 2, 3, 4, 5},
+		OmitEmpty: []int{},
 	}
 
-	errors := validator.ValidateStruct(u)
+	err := validator.ValidateStruct(tSuccess)
+	c.Assert(err, IsNil)
+
+	tFail := &TestSlice{
+		Required:  []int{},
+		Len:       []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1},
+		Min:       []int{},
+		Max:       []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1},
+		MinMax:    []int{},
+		OmitEmpty: []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1},
+	}
+
+	err = validator.ValidateStruct(tFail)
+
+	// Assert Top Level
+	c.Assert(err.Struct, Equals, "TestSlice")
+	c.Assert(len(err.Errors), Equals, 6)
+	c.Assert(len(err.StructErrors), Equals, 0)
 
-	fmt.Println(errors == nil)
+	// Assert Fields
+	AssertFieldError(err, "Required", "required", c)
+	AssertFieldError(err, "Len", "len", c)
+	AssertFieldError(err, "Min", "min", c)
+	AssertFieldError(err, "Max", "max", c)
+	AssertFieldError(err, "MinMax", "min", c)
+	AssertFieldError(err, "OmitEmpty", "max", c)
+}
+
+func (ms *MySuite) TestInvalidStruct(c *C) {
+	s := &SubTest{
+		Test: "1",
+	}
+
+	c.Assert(func() { validator.ValidateStruct(s.Test) }, PanicMatches, "interface passed for validation is not a struct")
+}
 
-	for _, i := range errors {
-		fmt.Printf("Error Struct:%s\n", i.Struct)
+func (ms *MySuite) TestInvalidField(c *C) {
+	s := &SubTest{
+		Test: "1",
+	}
 
-		for _, j := range i.Errors {
+	c.Assert(func() { validator.ValidateFieldByTag(s, "required") }, PanicMatches, "Invalid field passed to ValidateFieldWithTag")
+}
 
-			fmt.Printf("Error Field:%s Error Tag:%s\n", j.Field, j.ErrorTag)
-			fmt.Println(j.Error())
-		}
+func (ms *MySuite) TestInvalidTagField(c *C) {
+	s := &SubTest{
+		Test: "1",
 	}
 
+	c.Assert(func() { validator.ValidateFieldByTag(s.Test, "") }, PanicMatches, fmt.Sprintf("Invalid validation tag on field %s", ""))
 }
 
-// func TestValidateField(t *testing.T) {
-//
-// 	u := &User{
-// 		FirstName: "Dean Karn",
-// 		Details: &UserDetails{
-// 			"26 Here Blvd.",
-// 		},
-// 	}
-//
-// 	err := validator.ValidateFieldByTag(u.FirstName, "required")
-//
-// 	fmt.Println(err == nil)
-// 	fmt.Println(err)
-// }
+func (ms *MySuite) TestInvalidValidatorFunction(c *C) {
+	s := &SubTest{
+		Test: "1",
+	}
+
+	c.Assert(func() { validator.ValidateFieldByTag(s.Test, "zzxxBadFunction") }, PanicMatches, fmt.Sprintf("Undefined validation function on field %s", ""))
+}