diff --git a/src/activities/Elsa.Activities.Console/Activities/ReadLine.cs b/src/activities/Elsa.Activities.Console/Activities/ReadLine.cs
index 9df718795..6bf1a7f43 100644
--- a/src/activities/Elsa.Activities.Console/Activities/ReadLine.cs
+++ b/src/activities/Elsa.Activities.Console/Activities/ReadLine.cs
@@ -24,7 +24,7 @@ namespace Elsa.Activities.Console.Activities
     {
         private readonly TextReader input;
 
-        public ReadLine() : this(System.Console.In)
+        public ReadLine()
         {
         }
 
@@ -53,7 +53,7 @@ namespace Elsa.Activities.Console.Activities
 
         protected override ActivityExecutionResult OnResume(WorkflowExecutionContext context)
         {
-            var receivedInput = (string) context.Workflow.Input[VariableName];
+            var receivedInput = (string) context.Workflow.Input["ReadLineInput"];
             return Execute(context, receivedInput);
         }
 
diff --git a/src/core/Elsa.Abstractions/Services/IActivityBuilder.cs b/src/core/Elsa.Abstractions/Services/IActivityBuilder.cs
index f97f0c703..d579fc7b5 100644
--- a/src/core/Elsa.Abstractions/Services/IActivityBuilder.cs
+++ b/src/core/Elsa.Abstractions/Services/IActivityBuilder.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Linq.Expressions;
 using Elsa.Models;
 using Elsa.Services.Models;
 
@@ -12,6 +13,7 @@ namespace Elsa.Services
         IActivityBuilder Add<T>(Action<T> setup = default, string id = null) where T : class, IActivity;
         IOutcomeBuilder When(string outcome);
         IActivityBuilder Then<T>(Action<T> setup = null, Action<IActivityBuilder> branch = null, string id = null) where T : class, IActivity;
+        IActivityBuilder WithId(string id);
         IWorkflowBuilder Then(string activityId);
         WorkflowDefinitionVersion Build();
         ActivityDefinition BuildActivity();
diff --git a/src/core/Elsa.Core/WorkflowBuilders/ActivityBuilder.cs b/src/core/Elsa.Core/WorkflowBuilders/ActivityBuilder.cs
index 262331a7a..e91129e6a 100644
--- a/src/core/Elsa.Core/WorkflowBuilders/ActivityBuilder.cs
+++ b/src/core/Elsa.Core/WorkflowBuilders/ActivityBuilder.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Linq;
+using System.Linq.Expressions;
 using Elsa.Models;
 using Elsa.Services;
 using Elsa.Services.Models;
@@ -40,6 +41,12 @@ namespace Elsa.WorkflowBuilders
             return activityBuilder;
         }
 
+        public IActivityBuilder WithId(string id)
+        {
+            Id = id;
+            return this;
+        }
+
         public IWorkflowBuilder Then(string activityId)
         {
             WorkflowBuilder.Connect(
diff --git a/src/samples/Sample17/Activities/CreateDocument.cs b/src/samples/Sample17/Activities/CreatePerson.cs
similarity index 56%
rename from src/samples/Sample17/Activities/CreateDocument.cs
rename to src/samples/Sample17/Activities/CreatePerson.cs
index 7a2ed8bf5..853f54588 100644
--- a/src/samples/Sample17/Activities/CreateDocument.cs
+++ b/src/samples/Sample17/Activities/CreatePerson.cs
@@ -9,29 +9,36 @@ using Sample17.Models;
 
 namespace Sample17.Activities
 {
-    public class CreateDocument : Activity
+    public class CreatePerson : Activity
     {
         private readonly IWorkflowExpressionEvaluator expressionEvaluator;
 
-        public CreateDocument(IWorkflowExpressionEvaluator expressionEvaluator)
+        public CreatePerson(IWorkflowExpressionEvaluator expressionEvaluator)
         {
             this.expressionEvaluator = expressionEvaluator;
         }
-        
+
         public WorkflowExpression<string> TitleExpression
         {
             get => GetState<WorkflowExpression<string>>();
             set => SetState(value);
         }
 
+        public WorkflowExpression<int> AgeExpression
+        {
+            get => GetState<WorkflowExpression<int>>();
+            set => SetState(value);
+        }
+
         protected override async Task<ActivityExecutionResult> OnExecuteAsync(
             WorkflowExecutionContext context,
             CancellationToken cancellationToken)
         {
-            var title = await expressionEvaluator.EvaluateAsync(TitleExpression, context, cancellationToken);
-            var document = new Document { Title = title};
+            var name = await expressionEvaluator.EvaluateAsync(TitleExpression, context, cancellationToken);
+            var age = await expressionEvaluator.EvaluateAsync(AgeExpression, context, cancellationToken);
+            var person = new Person { FullName = name, Age = age };
 
-            Output["Document"] = document;
+            Output["Person"] = person;
             return Done();
         }
     }
diff --git a/src/samples/Sample17/CreateDocumentWorkflow.cs b/src/samples/Sample17/CreateDocumentWorkflow.cs
deleted file mode 100644
index 7c7886078..000000000
--- a/src/samples/Sample17/CreateDocumentWorkflow.cs
+++ /dev/null
@@ -1,27 +0,0 @@
-using Elsa.Activities.Console.Activities;
-using Elsa.Activities.Primitives;
-using Elsa.Expressions;
-using Elsa.Services;
-using Elsa.Services.Models;
-using Sample17.Activities;
-using Sample17.Models;
-
-namespace Sample17
-{
-    public class CreateDocumentWorkflow : IWorkflow
-    {
-        public void Build(IWorkflowBuilder builder)
-        {
-            builder
-                .StartWith<WriteLine>(x => x.TextExpression = new LiteralExpression("Enter a title"))
-                .Then<ReadLine>(id: "DocumentTitleInput")
-                .Then<CreateDocument>(x => x.TitleExpression = new JavaScriptExpression<string>("DocumentTitleInput.Input"), id: "CreateDocument")
-                .Then<SetVariable>(x =>
-                {
-                    x.VariableName = "Document";
-                    x.ValueExpression = new JavaScriptExpression<Document>("CreateDocument.Document");
-                })
-                .Then<WriteLine>(x => x.TextExpression = new JavaScriptExpression<string>("`A new document was created with title \"${Document.Title}\"`"));
-        }
-    }
-}
\ No newline at end of file
diff --git a/src/samples/Sample17/CreatePersonWorkflow.cs b/src/samples/Sample17/CreatePersonWorkflow.cs
new file mode 100644
index 000000000..af843d04f
--- /dev/null
+++ b/src/samples/Sample17/CreatePersonWorkflow.cs
@@ -0,0 +1,41 @@
+using Elsa.Activities.Console.Activities;
+using Elsa.Activities.Primitives;
+using Elsa.Expressions;
+using Elsa.Services;
+using Elsa.Services.Models;
+using Sample17.Activities;
+using Sample17.Models;
+
+namespace Sample17
+{
+    public class CreatePersonWorkflow : IWorkflow
+    {
+        public void Build(IWorkflowBuilder builder)
+        {
+            builder
+                .StartWith<WriteLine>(x => x.TextExpression = new LiteralExpression("Enter name:"))
+                .Then<ReadLine>().WithId("NameInput")
+                .Then<WriteLine>(x => x.TextExpression = new LiteralExpression("Enter age:"))
+                .Then<ReadLine>().WithId("AgeInput")
+                .Then<CreatePerson>(
+                    x =>
+                    {
+                        x.TitleExpression = new JavaScriptExpression<string>("NameInput.Input");
+                        x.AgeExpression = new JavaScriptExpression<int>("AgeInput.Input");
+                    }).WithId("CreatePerson")
+                .Then<SetVariable>(
+                    x =>
+                    {
+                        x.VariableName = "Person";
+                        x.ValueExpression = new JavaScriptExpression<Person>("CreatePerson.Person");
+                    })
+                .Then<SetVariable>(
+                    x =>
+                    {
+                        x.VariableName = "Age";
+                        x.ValueExpression = new JavaScriptExpression<int>("CreatePerson.Person.Age");
+                    })
+                .Then<WriteLine>(x => x.TextExpression = new JavaScriptExpression<string>("`A new person was created with name \"${Person.FullName}\" and age \"${Age}\"`"));
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/samples/Sample17/Models/Document.cs b/src/samples/Sample17/Models/Document.cs
deleted file mode 100644
index 4044442db..000000000
--- a/src/samples/Sample17/Models/Document.cs
+++ /dev/null
@@ -1,9 +0,0 @@
-namespace Sample17.Models
-{
-    public class Document
-    {
-        public string Title { get; set; }
-
-        public override string ToString() => Title;
-    }
-}
\ No newline at end of file
diff --git a/src/samples/Sample17/Models/Person.cs b/src/samples/Sample17/Models/Person.cs
new file mode 100644
index 000000000..c88f2ea3b
--- /dev/null
+++ b/src/samples/Sample17/Models/Person.cs
@@ -0,0 +1,10 @@
+namespace Sample17.Models
+{
+    public class Person
+    {
+        public string FullName { get; set; }
+        public int Age { get; set; }
+
+        public override string ToString() => FullName;
+    }
+}
\ No newline at end of file
diff --git a/src/samples/Sample17/Program.cs b/src/samples/Sample17/Program.cs
index 5a2d3a156..11ab1fe04 100644
--- a/src/samples/Sample17/Program.cs
+++ b/src/samples/Sample17/Program.cs
@@ -14,8 +14,8 @@ namespace Sample17
         {
             var services = BuildServices();
             var workflowInvoker = services.GetRequiredService<IWorkflowInvoker>();
-            var workflow = await workflowInvoker.StartAsync<CreateDocumentWorkflow>();
-            var document = workflow.CurrentScope.GetVariable<Document>("Document");
+            var workflowExecutionContext = await workflowInvoker.StartAsync<CreatePersonWorkflow>();
+            var document = workflowExecutionContext.CurrentScope.GetVariable<Person>("Document");
             
             Console.WriteLine("Created document: {0}", document);
         }
@@ -24,9 +24,10 @@ namespace Sample17
         {
             return new ServiceCollection()
                 .AddWorkflows()
-                .AddWorkflow<CreateDocumentWorkflow>()
+                .AddWorkflow<CreatePersonWorkflow>()
                 .AddConsoleActivities()
-                .AddActivity<CreateDocument>()
+                .AddActivity<CreatePerson>()
+                .AddSingleton(Console.In)
                 .BuildServiceProvider();
         }
     }