Poorly written requirements, unrealistic schedules, inadequate testing, adding new features after development is underway and poor communication.
Requirements are poorly written when they're unclear, incomplete, too general, or not testable; therefore there will be problems.
The schedule is unrealistic if too much work is crammed in too little time.
Software testing is inadequate if none knows whether or not the software is any good until customers complain or the system crashes.
It's extremely common that new features are added after development is underway.
Miscommunication either means the developers don't know what is needed, or customers have unrealistic expectations and therefore problems are guaranteed.
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