Good to hear Hamish. And, in my experience, it is a very practical and robust method.

After digesting your various helpful suggestions I have developed the following plan: 1. Create and save a notebook that I will call the Tutorial Master Notebook. This will eventually become the final product, theTutorial. 2. Create a first Working Notebook in which I will develop code to execute an interactive example ("the experiment"). When I am satisfied that the code is working properly, I will copy just the cell containing "the experiment" and insert it into the Tutorial Master Notebook. I will then open another notebook, Working Notebook #2, and develop another experiment and repeat the process of copying and inserting. And so on. 3. At any point in the development of the Tutorial, I may deploy the Tutorial Master Notebook as a CDF and, if it works as planned, save it as Version 1,2 etc until the final version is reached. There are evidently more elegant programmatic ways of accomplishing what I am after, but since i am a novice in Mathematica my plan is the most easily do-able at the moment. Perhaps it will be useful to others.

I am struggling with the general approach to this myself Hamish!

I have done some experimenting setting up string variables then just displaying them using the techniques above to suppress source code display.

At the moment it seems all the text in the text variables has to be in the source code as you cannot load files from cdf. Maybe the new cloud computing will completely transform this though? Over to the experts ...

Hello William, I am trying to develop some interactive tutorials where I provide the student with some textual background in a Mathematica CDF followed by interactive examples. But I would like to suppress (hide) all the code, mainly because the product looks less messy if it is not cluttered up with a lot of stuff that the student does not require. Sounds as if you have already accomplished that from the example you give. Can you please tell me how I can accomplish what I want to do or at least direct me to the part of the Documentation Center that deals with this sort of issue. It must turn up quite a lot. Thanks