| Almost all studies were program evaluations rather than experimental in design |
Research that adopts stronger outcome evaluation methodology to determine effectiveness of TTT programs |
| Limited geographical spread of SRH TTT programs represented, with the majority of studies reported being conducted in African countries |
Research that investigates SRH TTT model’s application across a more representative range of LMI countries; including the Pacific |
| Lack of diversity of SRH issues covered in the literature with the majority of studies focused on TTT programs addressing HIV |
Research that investigates TTT model’s application across a broader range of SRH topics; including STIs, gender equality, gender-based violence, unintended pregnancies, and unsafe abortion |