There's only a brief mention of mindmapping here, but it's obviously important to the author. Anyway, to me it's a great article on getting moving with writing. I hope you find it so, too.
The key to getting something useful out of this article is to read the author’s title carefully. Mind mapping simplifies the process of project estimating
-- it doesn’t simplify the actual task-time estimation
. Every project manger knows that the work of a project must be broken into separate and manageable units for estimating. To look at a project and think “That’s about a week’s effort” is a recipe for frustration and missed targets. Mindmaps, spider diagrams and bubble charts are excellent for the first phase of breaking a project into manageable parts. For me mindmaps, as strictly defined by Buzan’s rules, are less suitable than spider diagrams for this type of analysis, but we can assume that Dr. Mariaraj is not being too strict in his use of the term below.
I believe these rules are well worth following if you use mindmaps for learning. They are very hard to follow completely and rigidly - and its not worth trying I have found - if you use mindmaps in adult life, in your work or projects.
This comes up from time to time - usually in the form of "Buzan didn't invent mind mapping".
Here are links to important scholarly papers by Joseph D. Novak and Alberto J. Cañas on Concept Maps, their theory and construction.