This proposal would like SANS time to better understand the LAS phase diagram. This has been prompted by recent experiments which show the system is not fully understood under certain conditions.The keys issues I would like to address are: the temperature at which the phase of the LAS system starts to change; the exact ratio of SLES and C12E8, as co surfactants, which change the phase of the LAS system; the influence of Rhamnolipids on the LAS system, including effects of temperature and electrolyte effects on the system.