diff --git a/packages/squiggle-lang/__tests__/ReducerProject/ReducerProject_test.res b/packages/squiggle-lang/__tests__/ReducerProject/ReducerProject_test.res
index 466a8770..b4ede1a4 100644
--- a/packages/squiggle-lang/__tests__/ReducerProject/ReducerProject_test.res
+++ b/packages/squiggle-lang/__tests__/ReducerProject/ReducerProject_test.res
@@ -2,7 +2,6 @@
 module ExternalExpressionValue = ReducerInterface_ExternalExpressionValue
 module Project = ReducerProject
 module Bindings = Reducer_Bindings
-module Continuation = ReducerInterface_Value_Continuation
 
 open Jest
 open Expect
diff --git a/packages/squiggle-lang/__tests__/ReducerProject/ReducerProject_tutorial_test.res b/packages/squiggle-lang/__tests__/ReducerProject/ReducerProject_tutorial_test.res
new file mode 100644
index 00000000..07f1e973
--- /dev/null
+++ b/packages/squiggle-lang/__tests__/ReducerProject/ReducerProject_tutorial_test.res
@@ -0,0 +1,96 @@
+@@warning("-44")
+module ExternalExpressionValue = ReducerInterface_ExternalExpressionValue
+module Project = ReducerProject
+module Bindings = Reducer_Bindings
+
+open Jest
+open Expect
+open Expect.Operators
+
+describe("ReducerProject Tutorial", () => {
+  describe("Single source", () => {
+    /*
+Case "Running a single source". 
+*/
+    test("run", () => {
+      /* Let's start with running a single source and getting Result as well as the Bindings 
+       First you need to create a project. A project is a collection of sources. 
+       Project takes care of the dependencies between the sources, correct compilation and run order. 
+       You can run any source in the project. It will be compiled and run if it is not already done else already existing results will be presented.
+       The dependencies will be automatically compiled and run. So you don't need to worry about that in a multi source project.
+       In summary you issue a run command on the whole project or on a specific source to ensure that there is a result for that source.
+ */
+      let project = Project.createProject()
+      /* Every source has a name. This is used for debugging, dependencies and error messages. */
+      Project.setSource(project, "main", "1 + 2")
+      /* Let's run "main" source. */
+      project->Project.run("main")
+      /* Now you have a result for "main" source. 
+       Running one by one is necessary for UI to navigate among the sources and to see the results by source. 
+       And you're free to run any source you want. 
+       You will look at the results of this source and you don't want to run the others if not required.
+ */
+
+      /* However, you could also run the whole project.
+       If you have all the sources, you can always run the whole project. 
+       Dependencies and recompiling on demand will be taken care of by the project. 
+ */
+      project->Project.runAll
+
+      /* Either with run or runAll you executed the project. 
+       You can get the result of a specific source by calling getResult for that source. 
+       You can get the bindings of a specific source by calling getBindings for that source. 
+       If there is any runtime error, getResult will return the error.
+
+       Note that getResult returns None if the source has not been run.
+       Getting None means you have forgotten to run the source.
+ */
+      let result = project->Project.getExternalResult("main")
+      let bindings = project->Project.getExternalBindings("main")
+
+      /* Let's display the result and bindings */
+      (
+        result->ExternalExpressionValue.toStringOptionResult,
+        bindings->ExternalExpressionValue.EvModule->ExternalExpressionValue.toString,
+      )->expect == ("Ok(3)", "@{}")
+      /* You've got 3 with empty bindings. */
+    })
+
+    test("run summary", () => {
+      let project = Project.createProject()
+      Project.setSource(project, "main", "1 + 2")
+      Project.runAll(project)
+      let result = Project.getExternalResult(project, "main")
+      let bindings = Project.getExternalBindings(project, "main")
+      /* Now you have external bindings and external result. */
+      (
+        result->ExternalExpressionValue.toStringOptionResult,
+        bindings->ExternalExpressionValue.EvModule->ExternalExpressionValue.toString,
+      )->expect == ("Ok(3)", "@{}")
+    })
+
+    test("run with an environment", () => {
+      /* Running the source code like above allows you to set a custom environment */
+      let project = Project.createProject()
+
+      /* Optional. Set your custom environment anytime before running */
+      Project.setEnvironment(project, ExternalExpressionValue.defaultEnvironment)
+
+      Project.setSource(project, "main", "1 + 2")
+      Project.runAll(project)
+      let result = Project.getExternalResult(project, "main")
+      let _bindings = Project.getExternalBindings(project, "main")
+      result->ExternalExpressionValue.toStringOptionResult->expect == "Ok(3)"
+    })
+
+    test("shortcut", () => {
+      /* If you are running single source without includes and you don't need a custom environment, you can use the shortcut. */
+      /* Examples above was to prepare you for the multi source tutorial. */
+      let (result, bindings) = Project.evaluate("1+2")
+      (
+        result->ExternalExpressionValue.toStringResult,
+        bindings->ExternalExpressionValue.EvModule->ExternalExpressionValue.toString,
+      )->expect == ("Ok(3)", "@{}")
+    })
+  })
+})
diff --git a/packages/squiggle-lang/src/rescript/ReducerProject/ReducerProject.res b/packages/squiggle-lang/src/rescript/ReducerProject/ReducerProject.res
index 0b9f9385..1bba0aff 100644
--- a/packages/squiggle-lang/src/rescript/ReducerProject/ReducerProject.res
+++ b/packages/squiggle-lang/src/rescript/ReducerProject/ReducerProject.res
@@ -202,10 +202,11 @@ module Private = {
     let project = createProject()
     setSource(project, "main", sourceCode)
     runAll(project)
-    (
-      getResult(project, "main")->Belt.Option.getWithDefault(IEvVoid->Ok),
-      getContinuation(project, "main"),
-    )
+    let those = project->getContinuation("main")
+    let these = project->getStdLib
+    let ofUser = Continuation.minus(those, these)
+
+    (getResult(project, "main")->Belt.Option.getWithDefault(IEvVoid->Ok), ofUser)
   }
 }
 
@@ -409,6 +410,12 @@ let evaluate = (sourceCode: string): ('r, 'b) => {
   )
 }
 
+@genType
+let setEnvironment = (
+  this: reducerProject,
+  environment: ExternalExpressionValue.environment,
+): unit => this->T.Private.castToInternalProject->Private.setEnvironment(environment)
+
 @genType
 let foreignFunctionInterface = (
   lambdaValue: ExternalExpressionValue.lambdaValue,