Season 1
101 female trainees from 46 agencies compete for a place in a 11-member project group.
Episodes
1 Agency Evaluations Jan 22, 2016 
2 “Pick Me” Re-evaluation Jan 29, 2016 
3 Group Battle (1) Feb 5, 2016 
4 Group Battle (2) Feb 12, 2016 
5 First Elimination Feb 19, 2016 
6 Position Evaluation (1) Feb 26, 2016 
7 Position Evaluation (2) Mar 4, 2016 
8 Second Elimination and Concept Evaluation Preparations Mar 11, 2016 
9 Concept Evaluation Mar 18, 2016 
10 Third Elimination and Debut Evaluation Preparations Mar 25, 2016 
11 Live Finale: I.O.I Is Formed Apr 1, 2016