diff --git a/Sources/DependencyCalculator/DependencyCalculator.swift b/Sources/DependencyCalculator/DependencyCalculator.swift
index 182752e..b1220cd 100644
--- a/Sources/DependencyCalculator/DependencyCalculator.swift
+++ b/Sources/DependencyCalculator/DependencyCalculator.swift
@@ -8,7 +8,8 @@ import SelectiveTestLogger
 import Workspace
 
 public extension WorkspaceInfo {
-    func affectedTargets(changedFiles: Set<Path>) -> Set<TargetIdentity> {
+    func affectedTargets(changedFiles: Set<Path>,
+                         incldueIndirectlyAffected: Bool = true) -> Set<TargetIdentity> {
         var result = Set<TargetIdentity>()
 
         for path in changedFiles {
@@ -20,9 +21,13 @@ public extension WorkspaceInfo {
                 Logger.message("Changed file at \(path) appears not to belong to any target")
             }
         }
-
-        let indirectlyAffected = indirectlyAffectedTargets(targets: result)
-        return result.union(indirectlyAffected)
+        if incldueIndirectlyAffected {
+            let indirectlyAffected = indirectlyAffectedTargets(targets: result)
+            return result.union(indirectlyAffected)
+        }
+        else {
+            return result
+        }
     }
 
     internal func targetForFolder(_ path: Path) -> TargetIdentity? {
diff --git a/Sources/SelectiveTestingCore/SelectiveTestingTool.swift b/Sources/SelectiveTestingCore/SelectiveTestingTool.swift
index 45f2269..fe2eed3 100644
--- a/Sources/SelectiveTestingCore/SelectiveTestingTool.swift
+++ b/Sources/SelectiveTestingCore/SelectiveTestingTool.swift
@@ -16,6 +16,7 @@ public final class SelectiveTestingTool {
     private let basePath: Path
     private let printJSON: Bool
     private let renderDependencyGraph: Bool
+    private let turbo: Bool
     private let dot: Bool
     private let verbose: Bool
     private let testPlan: String?
@@ -27,6 +28,7 @@ public final class SelectiveTestingTool {
                 printJSON: Bool = false,
                 renderDependencyGraph: Bool = false,
                 dot: Bool = false,
+                turbo: Bool = false,
                 verbose: Bool = false) throws
     {
         if let configData = try? (Path.current + Config.defaultConfigName).read(),
@@ -46,6 +48,7 @@ public final class SelectiveTestingTool {
         self.basePath = Path(finalBasePath)
         self.printJSON = printJSON
         self.renderDependencyGraph = renderDependencyGraph
+        self.turbo = turbo
         self.dot = dot
         self.verbose = verbose
         self.testPlan = testPlan ?? config?.testPlan
@@ -70,7 +73,8 @@ public final class SelectiveTestingTool {
                                                              exclude: config?.exclude ?? [])
 
         // 3. Find affected targets
-        let affectedTargets = workspaceInfo.affectedTargets(changedFiles: changeset)
+        let affectedTargets = workspaceInfo.affectedTargets(changedFiles: changeset,
+                                                            incldueIndirectlyAffected: !turbo)
 
         if renderDependencyGraph {
             try Shell.exec("open -a Safari \"\(workspaceInfo.dependencyStructure.mermaidInURL(highlightTargets: affectedTargets))\"")
diff --git a/Sources/xcode-selective-test/SelectiveTesting.swift b/Sources/xcode-selective-test/SelectiveTesting.swift
index 510e3fa..ee0fea0 100644
--- a/Sources/xcode-selective-test/SelectiveTesting.swift
+++ b/Sources/xcode-selective-test/SelectiveTesting.swift
@@ -28,6 +28,9 @@ struct SelectiveTesting: AsyncParsableCommand {
     @Flag(help: "Output dependency graph in Dot (Graphviz) format")
     var dot: Bool = false
 
+    @Flag(help: "Turbo mode: run directly affected tests only")
+    var turbo: Bool = false
+    
     @Flag(help: "Produce verbose output")
     var verbose: Bool = false
 
@@ -38,6 +41,7 @@ struct SelectiveTesting: AsyncParsableCommand {
                                             printJSON: JSON,
                                             renderDependencyGraph: dependencyGraph,
                                             dot: dot,
+                                            turbo: turbo,
                                             verbose: verbose)
         let _ = try await tool.run()
     }
diff --git a/Tests/SelectiveTestingTests/IntegrationTestTool.swift b/Tests/SelectiveTestingTests/IntegrationTestTool.swift
index 0339a03..fac09aa 100644
--- a/Tests/SelectiveTestingTests/IntegrationTestTool.swift
+++ b/Tests/SelectiveTestingTests/IntegrationTestTool.swift
@@ -60,11 +60,11 @@ final class IntegrationTestTool {
 
     func createSUT(config: Config? = nil,
                    basePath: Path? = nil,
-                   testPlan: String? = nil) throws -> SelectiveTestingTool
+                   testPlan: String? = nil,
+                   turbo: Bool = false) throws -> SelectiveTestingTool
     {
         if let config {
             let configText = try config.save()
-            print("config: \(configText)")
             let path = Path.current + Config.defaultConfigName
             try configText.write(toFile: path.string, atomically: true, encoding: .utf8)
         }
@@ -73,6 +73,7 @@ final class IntegrationTestTool {
                                         basePath: basePath?.string,
                                         testPlan: testPlan,
                                         renderDependencyGraph: false,
+                                        turbo: turbo,
                                         verbose: true)
     }
 
diff --git a/Tests/SelectiveTestingTests/SelectiveTestingProjectTests.swift b/Tests/SelectiveTestingTests/SelectiveTestingProjectTests.swift
index b7374e3..66905f7 100644
--- a/Tests/SelectiveTestingTests/SelectiveTestingProjectTests.swift
+++ b/Tests/SelectiveTestingTests/SelectiveTestingProjectTests.swift
@@ -41,6 +41,21 @@ final class SelectiveTestingProjectTests: XCTestCase {
         ]))
     }
 
+    func testProjectAlone_turbo() async throws {
+        // given
+        let tool = try testTool.createSUT(config: nil,
+                                          basePath: "ExampleProject.xcodeproj",
+                                          turbo: true)
+        // when
+        try testTool.changeFile(at: testTool.projectPath + "ExampleProject/Deep/Path/ContentView.swift")
+
+        // then
+        let result = try await tool.run()
+        XCTAssertEqual(result, Set([
+            testTool.mainProjectMainTarget
+        ]))
+    }
+
     func testProjectDeepPathChange() async throws {
         // given
         let tool = try testTool.createSUT(config: nil,