MaryMac Books


For more than 30 years ITD has been Australia’s leading training organization using Jung’s theory of Psychological Types and related instruments, including the MajorsPTITM and the Myers-Briggs Type Indicator (MBTI®) instrument.  We continue to provide high quality training and certification in psychological type theory and the application of type theory.

Please contact Mary McGuiness on 0417661104  if you have any questions.

Online Books


Ideal resource for introducing clients to type. Packed with information, including two pages about each type!   RRP $13. 

Written and published in Australia.



   2021  Covid-19                                               

 ITD has ventured into VIRTUAL training.

 Due to social distancing recommendations during the covid-19 pandemic   ITD has temporarily suspended in person certification   programs and   advanced training workshops.   

 We hope to resume these later in 2021.

 For now we are offering some VIRTUAL training, seminars and   consultations.

 In-person training and consultations in the Sydneyarea are also available   by negotiation.


 Majors Personality Type Inventory Certification 

 Become certified to purchase and use this amazing instrument.

 Next Virtual program:  September 7, 8, 13, 14 & 15.
 Times: 9.15am to 1.30pm on each day
 Contact ITD for other dates. 


MajorsPT- Elements  (Step II)  Certification Program

Next Program:  July 6-7
Times: 9.15am to 1.30pm on both days

To REGISTER ....Call  ITD: 0417661104 or  EMAIL                                                                                           




URGENT Message


 To contact ITD until further   notice please use the email   address:        or call   0417661104.

Reason: Our email address  has not been working since June 22. The company that hosts our emails is Netregistry and they are having problems with their server!!?!#! 

If you have sent an email to  this week please re-send it to or call Mary on 0417661104.

We apologise for any inconvenience.



 Registration Form

 Book Order Form