Before investing in the new project, whether it be - ICO or IEO is necessary will study a lot of information. First of all it is necessary to look at team, good team - the key to success. It is also necessary to study and estimate whitepaper. It contains a lot of useful information!
You should always study projects in which you invest, the deeper the better. However, we all understand that we do not always have enough time for so many projects that we would like. Personally, I use the services of third-party analytical sites, in the trial framework.