Exercise 1: Why Indexed Organization Made DECLARATIVES Genuinely More Valuable Here — Possible Solution
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WHAT THE ORIGINAL SEQUENTIAL CUSTOMER-FILE'S REAL ERROR SURFACE LOOKED LIKE
Fundamentals' own sequential CUSTOMER-FILE was accessed almost
entirely through one real, repeating pattern: a priming READ followed
by more READs inside a PERFORM UNTIL loop, each with its own AT END
clause. The real range of things that could go wrong was genuinely
narrow - essentially just reaching the end of the file - and that one
condition was already handled consistently, inline, at every read.

WHAT CONVERTING TO A REAL INDEXED FILE GENUINELY CHANGES
This capstone's own Step 3 converts CUSTOMER-FILE to ORGANIZATION IS
INDEXED with ACCESS MODE IS DYNAMIC and a real RECORD KEY, replacing
the old linear scan with a real direct-by-key READ. Chapter 1's own
material establishes that indexed, dynamic-access files open up a
genuinely wider real range of possible I/O outcomes than a sequential
file ever had - INVALID KEY conditions for a missing record (code 23),
real possibilities around REWRITE/DELETE once the file is genuinely
updatable, and other real conditions sequential access structurally
never encountered at all.

WHY A WIDER REAL RANGE OF CONDITIONS MAKES REPEATED INLINE CHECKS GENUINELY MORE BURDENSOME
Chapter 6's own material frames DECLARATIVES as the fix for "the real
repetition problem" - the more places in a program that touch a file,
and the more distinct real conditions that file's own operations can
produce, the more repeated handling code inline checking would require
at every one of those places. Indexed, dynamic access genuinely
multiplies both of these factors compared to the old sequential file:
more kinds of real outcomes are possible, and this capstone's own
Step 3/Step 8 material shows the file now being touched from multiple
separate real programs (the batch job and the new CICS transaction),
not just one.

WHY DECLARATIVES IS GENUINELY MORE VALUABLE IN THIS SPECIFIC SITUATION
Because the newly-indexed CUSTOMER-FILE now has a genuinely wider set
of real conditions to handle, and is genuinely touched from more than
one program, centralizing that handling in one DECLARATIVES section
avoids duplicating an increasingly complex real set of checks across
multiple places - exactly the situation where DECLARATIVES' own real
value, established in Chapter 6, becomes most pronounced compared to
the simpler, narrower error surface the original sequential file ever
had.

ANSWER: The original sequential CUSTOMER-FILE had a genuinely narrow
real error surface - essentially just AT END, already handled
consistently inline at every read. Converting it to a real indexed,
dynamic-access file in Step 3 introduces a genuinely wider range of
possible real conditions (INVALID KEY on a missing record, real
REWRITE/DELETE possibilities, and more), and this capstone's own
material shows the file now being accessed from multiple separate
programs rather than just one. Because DECLARATIVES exists specifically
to avoid repeating handling logic across many places for many possible
conditions, it becomes genuinely more valuable here than it would have
been for the simpler, single-condition sequential file, where inline
handling was never much of a repetition burden to begin with.

WHY THIS WORKS AS AN ANSWER
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This correctly connects the real increase in both the number of
possible I/O conditions and the number of programs touching the file
to DECLARATIVES' own stated purpose, explaining specifically why the
value of centralizing handling grows alongside those two factors.