This is an article published in Momentum Magazine back in Sept 2007

The four barriers are:

• The Spiritual Barrier – Supernatural Resistance to the Gospel
• The Sociopolitical Barrier – Organized Resistance to the Gospel
• The Logistical Barrier – Logistical Challenges (E.g. Lack of Mobilization)
• The Cultural Barrier – Barriers to Understanding and Acceptance

MomentumArticle_4Barriers (click here and follow links to pdf)