Comment by tuyiown

I was very centered on the software part of the problem. A complex problem can be solved with a complicated chain of small technical solution. At implementation level, its complicated, not complex, e.g. you mostly need knowledge of the general problem to understand the solution, and many added things make things complicated.

My take is that if your complex problem is only solvable by complex software (e.g. not a combination of simple small parts), and _cannot_ be reduced to simpler things, you are in the complex space.

Maybe it's too reductive, it's just my opinion, but it's a good way for me to determine predictability on ability to solve a problem with many unknown, at the engineering level. The dangerous blockers are in complex space, identifying them early is critical. Complicated stuff can be worked around and solved later.