How to organise category and groups for GJ ?

Hi,

I am working on a big project for a parents' school association (2800 students / 4800 parents / 100 classes).

The idea is to propose the parents private groups that they will be invited to join depending on their children's class. For example, I have a boy in class "CM1C" and a girl in "CP1", I will be invited to join 2 groups : CM1C and CP1.

Using CBJuice2, we will prepopulate the DB with the parents details. A group of administrator will have access to all groups, they will be the one to send invitations, create category and groups. All groups will be on invitation only.

I have difficulties to understand the connexion between the category and the group. For example, the class level CM1 has 4 classes CM1A, CM1B, CM1C, CM1D. Each class is a group. From examples I saw, I could create a category "CM1" and 4 groups (CM1A, CM1B, CM1C, CM1D). But what is the difference with creating 4 categories / 4 groups ? What does it imply for administrator ? For users ?

Another question, I tried playing a little bit and I created 3 users, one being super admin. The super admin created one category and 3 groups, then invited the 2 other users to join 2 groups. I see the pending invitations under my admin profile but no "invitation to join" is visible under the 2 other users' profile.
My category access is set as "invited" and is not visible for the 2 other users.
What did I miss in the configuration to make the invitation visible ?
I am working on local.

I am working on CB 1.9.1 (quick start package) with Joomla 3.3.6. I followed the quick start documentation pdf for CB.

Thanks for your advise.

I have difficulties to understand the connexion between the category and the group. For example, the class level CM1 has 4 classes CM1A, CM1B, CM1C, CM1D. Each class is a group. From examples I saw, I could create a category "CM1" and 4 groups (CM1A, CM1B, CM1C, CM1D).

That would be my recommended approach.

But what is the difference with creating 4 categories / 4 groups ?

One category per group doesn't make a lot of sense.

What does it imply for administrator ? For users ?

Complexity of usage. A GJ category is a classification of GJ groups.

Another question, I tried playing a little bit and I created 3 users, one being super admin. The super admin created one category and 3 groups, then invited the 2 other users to join 2 groups. I see the pending invitations under my admin profile but no "invitation to join" is visible under the 2 other users' profile.
My category access is set as "invited" and is not visible for the 2 other users.
What did I miss in the configuration to make the invitation visible ?
I am working on local.

The 2 users should've received a notification to join. Either a PM via UddeIM or an email unless notifications are disabled entirely. They should see them on the "Invited" sub-tab of the Groups tab unless they've no access to the groups at all (e.g. can't access the category the group is in).