Thanks for the replies fellas but I think I'm gonna need a bit more help here... There are events + triggers + conditions for the control logic, all I want to do at this point is drop in 4 enemy tanks and have them attack from a different location each time. the X1, X2, Xnew etc... not exactly sure how this works> seems like this works in conjunction with the quartile brackets and dictates the "probability" of the random event. do i put in X4 if I want to have 4 enemy tanks? Does the X# correspond to the number of enemies I am trying to have in the game? How do I specify that the random variable is infact the origin of attack and not something else? I read the tutorial on SBwiki from the link provided- its only 3 paragraphs; gives a nice overall explanation of capabilities of the logic system but provides no concrete examples of "how to"- so I am still pretty lost here. This is one part of SB that I wish had more documentation to make it a bit more user friendly to create scenarios - Could one of you please toss up a screen shot large enough to read with the settings to simply have 4 enemy tanks attacking from a different location each time? How about giving the enemy 4 different types of vehicles- how do I program in to have them attack in different combinations? ie, enemy has a tank, heli, apc & rifle platoon. 1st battle the rifle platoon + heli attack me. 2nd battle the apc, tank + heli attack. 3rd battle its just the heli attacking.. & so forth. I'm sure for you SB veterans out there this is pretty easy stuff but for me, with no examples, just starting out building missions & adding in simple variables to make it interesting is like trying to troubleshoot a circuit board with no schematics! Thanks for your assistance Treadheads!!! Twistfish