diff --git a/config.yaml b/config.yaml
index 968deefd..de0e4686 100644
--- a/config.yaml
+++ b/config.yaml
@@ -1,13 +1,12 @@
 services:
   - name: twinnation
     url: https://twinnation.org/actuator/health
-    interval: 10
+    interval: 15
     failure-threshold: 3
     conditions:
       - "$STATUS == 200"
   - name: github
     url: https://github.com
-    interval: 10
-    failure-threshold: 3
     conditions:
-      - "$STATUS == 200"
\ No newline at end of file
+      - "$STATUS != 400"
+      - "$STATUS != 500"
\ No newline at end of file
diff --git a/config/config.go b/config/config.go
index 0d77a193..f248ae86 100644
--- a/config/config.go
+++ b/config/config.go
@@ -1,24 +1,15 @@
 package config
 
 import (
+	"github.com/TwinProduction/gatus/core"
 	"gopkg.in/yaml.v2"
 	"io/ioutil"
 )
 
 type Config struct {
-	Services []Service `yaml:"services"`
+	Services []*core.Service `yaml:"services"`
 }
 
-type Service struct {
-	Name             string      `yaml:"name"`
-	Url              string      `yaml:"url"`
-	Interval         uint        `yaml:"interval"`
-	FailureThreshold uint        `yaml:"failure-threshold"`
-	Conditions       []Condition `yaml:"conditions"`
-}
-
-type Condition string
-
 var config *Config
 
 func Get() *Config {
@@ -41,5 +32,13 @@ func ReadConfigurationFile(fileName string) *Config {
 func ParseConfigBytes(yamlBytes []byte) *Config {
 	config = &Config{}
 	yaml.Unmarshal(yamlBytes, config)
+	for _, service := range config.Services {
+		if service.FailureThreshold == 0 {
+			service.FailureThreshold = 1
+		}
+		if service.Interval == 0 {
+			service.Interval = 10
+		}
+	}
 	return config
 }
diff --git a/config/config_test.go b/config/config_test.go
index 9888dcf0..e923c2dd 100644
--- a/config/config_test.go
+++ b/config/config_test.go
@@ -7,16 +7,14 @@ func TestParseConfigBytes(t *testing.T) {
 services:
   - name: twinnation
     url: https://twinnation.org/actuator/health
-    interval: 10
+    interval: 15
     failure-threshold: 3
     conditions:
       - "$STATUS == 200"
   - name: github
     url: https://github.com
-    interval: 9
-    failure-threshold: 2
     conditions:
-      - "$STATUS != 405"
+      - "$STATUS != 400"
       - "$STATUS != 500"
 `))
 	if len(config.Services) != 2 {
@@ -28,17 +26,17 @@ services:
 	if config.Services[1].Url != "https://github.com" {
 		t.Errorf("URL should have been %s", "https://github.com")
 	}
-	if config.Services[0].Interval != 10 {
-		t.Errorf("Interval should have been %d", 10)
+	if config.Services[0].Interval != 15 {
+		t.Errorf("Interval should have been %d", 15)
 	}
-	if config.Services[1].Interval != 9 {
-		t.Errorf("Interval should have been %d", 9)
+	if config.Services[1].Interval != 10 {
+		t.Errorf("Interval should have been %d, because it is the default value", 10)
 	}
 	if config.Services[0].FailureThreshold != 3 {
 		t.Errorf("FailureThreshold should have been %d", 3)
 	}
-	if config.Services[1].FailureThreshold != 2 {
-		t.Errorf("FailureThreshold should have been %d", 2)
+	if config.Services[1].FailureThreshold != 1 {
+		t.Errorf("FailureThreshold should have been %d, because it is the default value", 1)
 	}
 	if len(config.Services[0].Conditions) != 1 {
 		t.Errorf("There should have been %d conditions", 1)
diff --git a/core/types.go b/core/types.go
new file mode 100644
index 00000000..c92addd9
--- /dev/null
+++ b/core/types.go
@@ -0,0 +1,126 @@
+package core
+
+import (
+	"fmt"
+	"net"
+	"net/http"
+	"net/url"
+	"strconv"
+	"strings"
+	"time"
+)
+
+type Result struct {
+	HttpStatus      int
+	Hostname        string
+	Ip              string
+	Duration        time.Duration
+	Errors          []error
+	ConditionResult []*ConditionResult
+}
+
+type Service struct {
+	Name             string       `yaml:"name"`
+	Url              string       `yaml:"url"`
+	Interval         int          `yaml:"interval,omitempty"`
+	FailureThreshold int          `yaml:"failure-threshold,omitempty"`
+	Conditions       []*Condition `yaml:"conditions"`
+}
+
+func (service *Service) getIp(result *Result) {
+	urlObject, err := url.Parse(service.Url)
+	if err != nil {
+		result.Errors = append(result.Errors, err)
+		return
+	}
+	result.Hostname = urlObject.Hostname()
+	ips, err := net.LookupIP(urlObject.Hostname())
+	if err != nil {
+		result.Errors = append(result.Errors, err)
+		return
+	}
+	result.Ip = ips[0].String()
+}
+
+func (service *Service) getStatus(result *Result) {
+	client := &http.Client{
+		Timeout: time.Second * 10,
+	}
+	startTime := time.Now()
+	response, err := client.Get(service.Url)
+	if err != nil {
+		result.Errors = append(result.Errors, err)
+		return
+	}
+	result.Duration = time.Now().Sub(startTime)
+	result.HttpStatus = response.StatusCode
+}
+
+func (service *Service) EvaluateConditions() *Result {
+	result := &Result{}
+	service.getStatus(result)
+	service.getIp(result)
+	for _, condition := range service.Conditions {
+		condition.Evaluate(result)
+	}
+	return result
+}
+
+type ConditionResult struct {
+	Condition   *Condition
+	Success     bool
+	Explanation string
+}
+
+type Condition string
+
+func (c *Condition) Evaluate(result *Result) {
+	condition := string(*c)
+	if strings.Contains(condition, "==") {
+		parts := sanitizeAndResolve(strings.Split(condition, "=="), result)
+		if parts[0] == parts[1] {
+			result.ConditionResult = append(result.ConditionResult, &ConditionResult{
+				Condition:   c,
+				Success:     true,
+				Explanation: fmt.Sprintf("%s is equal to %s", parts[0], parts[1]),
+			})
+		} else {
+			result.ConditionResult = append(result.ConditionResult, &ConditionResult{
+				Condition:   c,
+				Success:     false,
+				Explanation: fmt.Sprintf("%s is not equal to %s", parts[0], parts[1]),
+			})
+		}
+	} else if strings.Contains(condition, "!=") {
+		parts := sanitizeAndResolve(strings.Split(condition, "!="), result)
+		if parts[0] != parts[1] {
+			result.ConditionResult = append(result.ConditionResult, &ConditionResult{
+				Condition:   c,
+				Success:     true,
+				Explanation: fmt.Sprintf("%s is not equal to %s", parts[0], parts[1]),
+			})
+		} else {
+			result.ConditionResult = append(result.ConditionResult, &ConditionResult{
+				Condition:   c,
+				Success:     false,
+				Explanation: fmt.Sprintf("%s is equal to %s", parts[0], parts[1]),
+			})
+		}
+	}
+}
+
+func sanitizeAndResolve(list []string, result *Result) []string {
+	var sanitizedList []string
+	for _, element := range list {
+		element = strings.TrimSpace(element)
+		switch strings.ToUpper(element) {
+		case "$STATUS":
+			element = strconv.Itoa(result.HttpStatus)
+		case "$IP":
+			element = result.Ip
+		default:
+		}
+		sanitizedList = append(sanitizedList, element)
+	}
+	return sanitizedList
+}
diff --git a/main.go b/main.go
index 65327194..309a1804 100644
--- a/main.go
+++ b/main.go
@@ -3,15 +3,13 @@ package main
 import (
 	"fmt"
 	"github.com/TwinProduction/gatus/config"
-	"github.com/TwinProduction/gatus/watchdog"
 )
 
 func main() {
-	request := watchdog.Request{Url: "https://twinnation.org/actuator/health"}
-	result := &watchdog.Result{}
-	request.GetIp(result)
-	request.GetStatus(result)
-	fmt.Println(result)
-
-	fmt.Println(config.Get())
+	for _, service := range config.Get().Services {
+		result := service.EvaluateConditions()
+		for _, conditionResult := range result.ConditionResult {
+			fmt.Printf("%v\n", *conditionResult)
+		}
+	}
 }
diff --git a/watchdog/watchdog.go b/watchdog/watchdog.go
index 8ae4c024..03fb525e 100644
--- a/watchdog/watchdog.go
+++ b/watchdog/watchdog.go
@@ -1,49 +1 @@
 package watchdog
-
-import (
-	"net"
-	"net/http"
-	"net/url"
-	"time"
-)
-
-type Request struct {
-	Url string
-}
-
-type Result struct {
-	HttpStatus int
-	Hostname   string
-	Ip         string
-	Duration   time.Duration
-	Errors     []error
-}
-
-func (request *Request) GetIp(result *Result) {
-	urlObject, err := url.Parse(request.Url)
-	if err != nil {
-		result.Errors = append(result.Errors, err)
-		return
-	}
-	result.Hostname = urlObject.Hostname()
-	ips, err := net.LookupIP(urlObject.Hostname())
-	if err != nil {
-		result.Errors = append(result.Errors, err)
-		return
-	}
-	result.Ip = ips[0].String()
-}
-
-func (request *Request) GetStatus(result *Result) {
-	client := &http.Client{
-		Timeout: time.Second * 10,
-	}
-	startTime := time.Now()
-	response, err := client.Get(request.Url)
-	if err != nil {
-		result.Errors = append(result.Errors, err)
-		return
-	}
-	result.Duration = time.Now().Sub(startTime)
-	result.HttpStatus = response.StatusCode
-}