diff --git a/executor/executor.go b/executor/executor.go
index 4dc537b3..b3ff1108 100644
--- a/executor/executor.go
+++ b/executor/executor.go
@@ -5,6 +5,6 @@ import (
 )
 
 // Run will be used to execute steps
-func Run(jobDef []screwdriver.JobDef) error {
+func Run(jobDefs []screwdriver.JobDef) error {
 	return nil
 }
diff --git a/launch.go b/launch.go
index 0b5d8058..e26dde32 100644
--- a/launch.go
+++ b/launch.go
@@ -103,7 +103,7 @@ func prNumber(jobName string) string {
 	if matched == nil || len(matched) != 2 {
 		return ""
 	}
-
+	log.Println("Build is a PR: ", matched[1])
 	return matched[1]
 }
 
diff --git a/launch_test.go b/launch_test.go
index dd2b7fcd..72b381b9 100644
--- a/launch_test.go
+++ b/launch_test.go
@@ -419,10 +419,14 @@ func TestPipelineDefFromYaml(t *testing.T) {
 	testBuildID := "BUILDID"
 	testJobID := "JOBID"
 	testRoot := "/sd/workspace"
+
 	mainJob := screwdriver.JobDef{
 		Image: "node:4",
-		Steps: map[string]string{
-			"install": "npm install",
+		Commands: []screwdriver.CommandDef{
+			screwdriver.CommandDef{
+				Name: "install",
+				Cmd:  "npm install",
+			},
 		},
 		Environment: map[string]string{
 			"NUMBER": "3",
diff --git a/screwdriver/screwdriver.go b/screwdriver/screwdriver.go
index bb902169..7a9e0bd7 100644
--- a/screwdriver/screwdriver.go
+++ b/screwdriver/screwdriver.go
@@ -46,7 +46,7 @@ func New(url, token string) (API, error) {
 	return API(api), nil
 }
 
-// BuildStatus is a Screwdriver Build Status payload
+// BuildStatus is a Screwdriver Build Status payload.
 type BuildStatus struct {
 	Status string `json:"status"`
 }
@@ -56,32 +56,38 @@ type Validator struct {
 	Yaml string `json:"yaml"`
 }
 
-// Pipeline is a Screwdriver Pipeline definition
+// Pipeline is a Screwdriver Pipeline definition.
 type Pipeline struct {
 	ID     string `json:"id"`
 	ScmURL string `json:"scmUrl"`
 }
 
-// PipelineDef contains the step definitions and jobs for a Pipeline
+// PipelineDef contains the step definitions and jobs for a Pipeline.
 type PipelineDef struct {
 	Jobs     map[string][]JobDef `json:"jobs"`
 	Workflow []string            `json:"workflow"`
 }
 
-// JobDef contains the step and environment definitions of a single Job
+// JobDef contains the step and environment definitions of a single Job.
 type JobDef struct {
 	Image       string            `json:"image"`
-	Steps       map[string]string `json:"steps"`
+	Commands    []CommandDef      `json:"commands"`
 	Environment map[string]string `json:"environment"`
 }
 
-// Job is a Screwdriver Job
+// Job is a Screwdriver Job.
 type Job struct {
 	ID         string `json:"id"`
 	PipelineID string `json:"pipelineId"`
 	Name       string `json:"name"`
 }
 
+// CommandDef is the definition of a single executable command.
+type CommandDef struct {
+	Name string `json:"name"`
+	Cmd  string `json:"command"`
+}
+
 // Build is a Screwdriver Build
 type Build struct {
 	ID    string `json:"id"`
diff --git a/screwdriver/screwdriver_test.go b/screwdriver/screwdriver_test.go
index a54a3439..cc25c93f 100644
--- a/screwdriver/screwdriver_test.go
+++ b/screwdriver/screwdriver_test.go
@@ -182,31 +182,37 @@ func TestPipeline404(t *testing.T) {
 
 func TestPipelineFromYaml(t *testing.T) {
 	json := `{
-	  "jobs": {
-	    "main": [
-	      {
-	        "image": "node:4",
-	        "steps": {
-	          "install": "npm install"
-	        },
-	        "environment": {
-	          "ARRAY": "[\"a\",\"b\"]",
-	          "BOOL": "true",
-	          "OBJECT": "{\"a\":\"cat\",\"b\":\"dog\"}",
-	          "NUMBER": "3",
-	          "DECIMAL": "3.1415927",
-	          "STRING": "test"
-	        }
-	      }
-	    ]
-	  },
-	  "workflow": []
-	}`
+    "jobs": {
+      "main": [
+        {
+          "image": "node:4",
+          "commands": [
+            {
+              "name": "install",
+              "command": "npm install"
+            }
+          ],
+          "environment": {
+            "ARRAY": "[\"a\",\"b\"]",
+            "BOOL": "true",
+            "OBJECT": "{\"a\":\"cat\",\"b\":\"dog\"}",
+            "NUMBER": "3",
+            "DECIMAL": "3.1415927",
+            "STRING": "test"
+          }
+        }
+      ]
+    },
+    "workflow": []
+  }`
 
 	mainJob := JobDef{
 		Image: "node:4",
-		Steps: map[string]string{
-			"install": "npm install",
+		Commands: []CommandDef{
+			CommandDef{
+				Name: "install",
+				Cmd:  "npm install",
+			},
 		},
 		Environment: map[string]string{
 			"ARRAY":   `["a","b"]`,