1.  How many specifications are there in RPG IV? What are they?

There are seven specifications are exits in RPG IV. They are listed below:

o    Control Specification ( H)

o    File Description specification (F)

o    Definition specification (D)

o    Input specification (I)

o    Calculation specification (C)

o    Output specification (O)

o    Procedure specification (P)

2.  Is it necessary to define all specifications in RPG IV? Which are mandatory and which are optional?

No, all are optional.