Workload Assessment Tool

NASA Task Load Index (NASA-TLX)

Evaluate multidimensional workload across 6 subscales: Mental, Physical, Temporal, Performance, Effort, and Frustration.

Instrument version, scoring, and data handling

Version: Raw TLX and weighted NASA-TLX across six workload dimensions.

Scoring: Raw TLX averages the six ratings; weighted TLX applies the 15 pairwise-comparison weights.

Data handling: CSV mode creates a file only on this device; the portfolio server does not receive the response. Google Sheets mode sends the participant ID, condition, item responses, calculated scores, tool name, sheet/tab name, and timestamp to the Google Sheet Web App URL entered by the researcher. Nothing is sent until the final save action. Completion is shown only when that script returns JSON with success: true (or ok: true) after appending the row.

Step 1 Select Evaluation Method

Step 3 Select Data Save Option

Data Save Option

Google SheetsAppend data directly to your Google SheetDownload CSVSave responses to a local CSV file

Sheet / Tab Name *

Google Sheet Link *

💡 How to connect your Google Sheet (10-second setup)

Create or open your target Google Sheet.
Click Share (top right) → under General access, change to Anyone with the link can edit.
Copy the Google Sheet link from your browser address bar and paste it into the input box above!

Advanced: Using a custom Google Apps Script deployment

If you prefer to deploy your own private script instead of sharing your sheet link, copy the script below, deploy it as a Web App (access: Anyone), and paste your /exec URL above:

function doPost(e) {
  var lock = LockService.getScriptLock();
  lock.tryLock(10000);
  try {
    var ss = SpreadsheetApp.getActiveSpreadsheet();
    var data = JSON.parse(e.postData.contents);
    var rowsToAppend = [];
    var sheetName = "Sheet1";

    if (Array.isArray(data)) {
      rowsToAppend = data;
    } else if (data && Array.isArray(data.rows)) {
      sheetName = data.sheetName || "Sheet1";
      rowsToAppend = data.rows;
    } else if (data) {
      sheetName = data.sheetName || "Sheet1";
      var obj = {};
      for (var k in data) { if (k !== 'sheetName') obj[k] = data[k]; }
      rowsToAppend = [obj];
    }

    if (rowsToAppend.length === 0) return ContentService.createTextOutput(JSON.stringify({ success: false })).setMimeType(ContentService.MimeType.JSON);

    var sheet = ss.getSheetByName(sheetName) || ss.insertSheet(sheetName);
    var keys = Object.keys(rowsToAppend[0]);
    if (sheet.getLastRow() === 0) sheet.appendRow(keys);

    rowsToAppend.forEach(function(r) {
      sheet.appendRow(keys.map(function(k) { return (r[k] !== undefined && r[k] !== null) ? r[k] : ""; }));
    });

    return ContentService.createTextOutput(JSON.stringify({ success: true })).setMimeType(ContentService.MimeType.JSON);
  } catch(err) {
    return ContentService.createTextOutput(JSON.stringify({ success: false, error: err.toString() })).setMimeType(ContentService.MimeType.JSON);
  } finally {
    lock.releaseLock();
  }
}

This URL is remembered only in this browser on this device.

NASA Task Load Index (NASA-TLX) References(3 papers)

View References

Primary validation and literature sources for workload assessment:

[1]

Hart, S. G., & Staveland, L. E. (1988). Development of NASA-TLX (Task Load Index): Results of empirical and theoretical research. Advances in Psychology, 52, 139-183.

DOI

[2]

Hart, S. G. (2006). NASA-Task Load Index (NASA-TLX); 20 years later. Proceedings of the Human Factors and Ergonomics Society Annual Meeting, 50(9), 904-908.

DOI

[3]

Nygren, T. E. (1991). Psychometric properties of scales for assessing subjective workload: A comparison of NASA-TLX, SWAT, and modified Cooper-Harper scales. Human Factors, 33(1), 17-33.

DOI

NASA Task Load Index (NASA-TLX)

Step 1 Select Evaluation Method

Step 2 Select Scale Range

Step 3 Select Data Save Option

Step 4 Participant Details & Workload Rating

Pairwise Dimension Comparison (Weights)

Workload Subscale Ratings (0 - 100)

NASA-TLX Assessment Completed!