"...กำลังมองปัญหาแบบเชิงคณิตศาสตร์ มองในภาพรวม แล้วหาทาง optimize ให้ดีที่สุด..,"

Yes, but very "loosely". More to my view is to ask extra questions on the way to solve any problem. To give an example: when we are looking for a way to reduce dependency on "import" coal, gas and oil. A solution like "drill and frack for gas in Thailand" is not a solution in my view. Because it creates health and environment problems for local people, comtamination of underground water; toxic chemicals and so on. A better solution would reduce dependency on all sources (including biomass, biofuel) of coal, gas and oil. That's we include CO2 problems as another constraint on solutions. We can add in as many constraints as we need and find ways to express the constraints in the same terms as "the" problem or simply add constraints like "must create x jobs for people in y local counxils in z years",...

It is desirable to have "mathematical model of system to optimize", but when we don't have one yet, we will have to solve constraint problems but argument and (gu)estimate. I guess this is where you are concerned about "อารมณ์มนุษย์มันโมเดลยากครับ ....ต้องเพ่งด้านนี้ด้วย ไม่งั้น...คงปรองดู ลำบาก". To this I say "we also play with mass emotion --and psychology-- to get certain solutions accepted. (In polical term --we do lobby-- ;-)