Hello Mary,
The OaSIS database is indeed quite extensive and there are several layers of data to dig through. It will take time getting familiar with it and Tami is taking steps to secure a presenter at our conference this year to provide more details on the ins and outs of OaSIS. I was recently in touch with Mr. Marc Gendron at ESDC and asked him if they could provide more details on how the scales were designed and the meaning of each ratings. He told me that ESDC has been using a ratings guide which will be made available in the near future. Also more details on the ratings will be added in OaSIS as well as examples of tasks to illustrate each level, which should help better understand what each level means.
I was also told that OaSIS data is presented concurrently but independently from the Career Handbook, OaSIS being primarily inspired by O*NET. I have noted that several traits are shared between OaSIS and the Career Handbook but with different ratings for the same occupation. This could lead to confusion and we will need clarification on how to handle these types of discrepancies. We will surely learn more in the coming months!
Happy new year to you as well!