List of Articles Correctness Open Access Article Abstract Page Full-Text 1 - The Review of Nullification of Void Clauses in Contract with Emphasis on Imam Khomeiniâs view abolfazl Alishahi Mohammadreza Hamidi masoumeh hamidi Open Access Article Abstract Page Full-Text 2 - Investigating the effect of educational management knowledge on school principals’ decision-making power faranak mosavi Open Access Article Abstract Page Full-Text 3 - Dddition operation strategies in first grade students:an empirical study Parirokh Dadsetan Laleh Vahidi Farhad Shaghaghi