Common noun: When it refers to the process of creating or making something, it's a common noun. For example:
* "The factory increased its production of cars."
* "We had a great deal of production problems this month."
Abstract noun: When it refers to the result of the process, it's an abstract noun. For example:
* "The play received critical acclaim for its innovative production."
* "The new album is a testament to the band's high-quality production."
In both cases, "production" is a singular noun.