Ok you 2 youngsters.. cough2..

maybe not familiar with precast methods back in the 80's & 90's
Basically instead of building the wall brick by brick, they do the entire wall in factory, then transport it using huge trucks to construction site, then they erect the wall & lock it using stelel bar (if u do tangliung aka lanterns for moon cake Festival then you would understand, finally they use some cement to plaster the gap as surely there are some gap between the wall, so after sometimes the wall will give way aka cracked then you will ahve hell time repairing it over & over again.
You can easily recognized such method by looking at the house, usually the house will be a square box then add in some roof & verdah, as precast method cant have much design, actually only low cost house using this method.
I know coz one of my ex senior colleague bought a unit in Desa Setapak, told the finishing really teruk.
Not sure about your area but all the apartment condo I seen using conventional method which is brick by brick.
I heard current precast technology improved but not sure how much better compared to 20 years ago.
But buying such property is a sure no no for me.
Ok you senior.
then as a buyer how do I know which method will my developer be using? Pre-clay is only for condo/apartment? Landed can't apply the same?