I'm working in a software project with about 25 students (divided in 4 groups). As right now we use Slack for chatting and sharing important decisions we make. Slack is an communication tool similar to WhatsApp with easy use of groups.
As I've noticed, everyday there are about 1-10 decisions shared each day, in a special "decisions-group". These decisions are quite important, mostly for the exact same day but not for everyone. These are not all related to code, an possible decision is the change of code coverage lines. Not everyone is aware of all decisions that are made every day. I have done multiple samples and noticed that there were always people not aware of some decisions. In this problem, I'm not sure if it's a problem with a lack of discipline to actually read the decisions, or if sharing those in a chat is just ineffective. Our intentions of using a chat, is to prevent disturbing everyone constantly.
How can I ensure knowledge of decisions is shared in a small project (25 people), in which everyone is aware of the decisions being made, without disturbing everyone constantly?