The requirements for demographic separation depend on geographic and other circumstances that may not be attainable in all cases. For example, much of Israel's difficulty in containing suicide terrorism derives from the deeply intermixed settlement patterns of the West Bank and Gaza, which make the effective length of the border between Palestinian and have rendered even very intensive (Kaufmann 1998). As a result, terrorial concessions could well encourage terrorists leaders to strive for still greater gains while greater repression may only exacerbate the conditions of occupation that cultivate more recruits for terrorist organizations. instead, the best course to improve israel's security may well be a combined strategy: abandoning territory on the West Bank along with an actual wall that physically separates the populations.