There is no denying that charter schools in many communities often face serious obstacles when dealing with their districts. (necharters.org)
It constitutes one of the most serious obstacles to the evolution of a harmonious global society, both within national societies and on the international scene. (religion-online.org)
In the meantime, the above articles may show that our existing laws aren't as serious an obstacle to electronic transactions as might appear. (slaw.ca)