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Module 2: Requirements & SRS

20267m

Develop a decision table for an online loan-processing system using customer eligibility, income level, credit score and document verification as conditions. Derive the corresponding system actions.

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Decision Table: Online Loan-Processing System

Conditions

  • C1 Customer eligible? (Y/N)
  • C2 Income level adequate? (Y/N)
  • C3 Credit score good? (Y/N)
  • C4 Documents verified? (Y/N)

Actions

  • A1 Approve loan
  • A2 Reject loan
  • A3 Request additional documents
  • A4 Refer to manual review (e.g. reduced amount or higher interest)

Decision table ("-" = don't care)

R1 R2 R3 R4 R5 R6
C1 Eligible N Y Y Y Y Y
C2 Income adequate - - Y Y N N
C3 Credit score good - - Y N Y N
C4 Documents verified - N Y Y Y Y
A1 Approve loan X
A2 Reject loan X X
A3 Request documents X
A4 Manual review X X

Derived system actions

  1. R1: not eligible, so reject whatever the other conditions are.
  2. R2: eligible but documents not verified, so request more documents.
  3. R3: eligible, income adequate, good credit, documents verified, so approve.
  4. R4 / R5: eligible and documents verified, but only one of income/credit is satisfactory, so manual review.
  5. R6: eligible and documents verified, but both income and credit are poor, so reject.

Completeness check

Without "don't cares" the table needs 2^4 = 16 rules. R1 covers 8, R2 covers 4, and R3 to R6 cover 1 each (documents verified = Y), so 8 + 4 + 4 = 16: every combination is covered and none overlaps.

The business rules above are assumptions; state them in the exam.

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