Create your evaluation form using fields where you want responses. With fields you can determine the type of content and the amount of content so that your form doesn't lose its formatting easily.
Where you want text to be entered, click the cursor then click on the Developer tab, click on Design Mode, then click on the icon that looks like a folder with tools (lower right centre of the Controls Group). Click on the First icon (ab|) which is a text form field. This will insert a field into your document. Click on Properties and enter the type of information, default text, format, length of text etc.
Do this for each area where text will be entered.
When all is completed, click on the Developer tab, Protect Document, a dialogue box will open.
Go to item 2 and select Filling in Forms. Click on Start Enforcing Protection. Assign a password. Now save the document by clicking on the Office Button, Save As, fill in a name for the template, then Save as Type and choose Word Template (*.dotx)
You have now created a template that has fields to fill in that have restrictions on their content and the text of the form itself cannot be changed by the user.