diff --git a/files/other/skilltree.js b/files/other/skilltree.js
index 2aa27ff..e5f5981 100644
--- a/files/other/skilltree.js
+++ b/files/other/skilltree.js
@@ -87,7 +87,7 @@ function _getRect(parent, data) {
 		const allowBuy = aSkillPoints > 0 && isParentEnabled;
 		
 		div.innerHTML += `
-<button onclick='_buySkill(${JSON.stringify(data)})' style="${allowBuy ? bttnStyle: bttnStyleDisabled}" ${allowBuy ? "": "disabled"}>Kaufen</button>
+<button onclick='_buySkill(${JSON.stringify(data)})' style="${allowBuy ? bttnStyle: bttnStyleDisabled}" ${allowBuy ? "": "disabled"}>Kaufen (1 Skillpoint)</button>
 		`;
 	}
 	
diff --git a/files/student/uebersicht.html b/files/student/uebersicht.html
index 9f7961d..f72b99c 100644
--- a/files/student/uebersicht.html
+++ b/files/student/uebersicht.html
@@ -210,6 +210,9 @@ async function startSurvey() {
 	console.log(code);
 	var course = await couchDB.get("course:" + code);
 	if (course != undefined) {
+		const voted = course.voted_user ??= [];
+		if (voted.includes(userData.name)) return;
+		
 		const users = await couchDB.get("users");
 		users[userData.name].courses ??= [];
 		if (!users[userData.name].courses.includes(code)) {
@@ -222,13 +225,22 @@ async function startSurvey() {
 	}
 }
 
+async function bttnStartSurvey(code) {
+	var course = await couchDB.get("course:" + code);
+	const voted = course.voted_user ??= [];
+	if (voted.includes(userData.name)) return;
+	location.href = "./umfrage.html?course=" + code;
+}
+
 async function setCourseView() {
 	const courseList = document.getElementById("courses-list");
 	courseList.innerHTML = "";
 
 	for (const courseId of userData.courses) {
 		const course = await couchDB.get("course:" + courseId);
-
+		
+		const hasVoted = (course.voted_user ??= []).includes(userData.name);
+		
 		const expire_date = new Date(course.expire_date);
 		const isExpired = expire_date < new Date();
 		
@@ -247,8 +259,8 @@ async function setCourseView() {
 	${course.description}
 </div>
 
-${isExpired ? '': `
-<button class="action start" onclick='location.href = "./umfrage.html?course=${courseId.trim()}";'>
+${isExpired || hasVoted ? '': `
+<button class="action start" onclick='bttnStartSurvey("${courseId.trim()}");'>
 	Umfrage Starten
 </button>`
 }
diff --git a/files/student/umfrage.html b/files/student/umfrage.html
index 0ea24bf..56bf0f2 100644
--- a/files/student/umfrage.html
+++ b/files/student/umfrage.html
@@ -152,12 +152,18 @@ async function setCourse() {
 	
 	return true;
 }
-async function updateCourseAnswer(answer) {
+async function updateCourseAnswer(answer, done = false) {
 	const args = getURLArgsMap();
 	const coursename = args.course;
 	if (!coursename) return null;
 	const kurs = await couchDB.get("course:" + coursename);
 	if (!kurs) return null;
+	
+	if (done) {
+		const voted = kurs.voted_user ??= [];
+		if (!voted.includes(userData.name)) voted.push(userData.name);
+	}
+	
 	kurs.result.push(answer);
 	await couchDB.set("course:" + coursename, kurs);
 	return kurs;
@@ -275,7 +281,7 @@ function updateContent(old_page, page) {
 }
 
 async function onFinishEva() {
-	await updateCourseAnswer(finalResult);
+	await updateCourseAnswer(finalResult, true);
 	if (await levelUpXP(couchDB)) {
 		const e = getId("level_up");
 		if (e) e.style.display = "unset";