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Understanding Decision Tables: Construction and Types for Effective Decision-Making

A decision table is a structured representation of rules and conditions impacting decisions. It organizes information into quadrants, facilitating clearer analysis. To construct a decision table (DT), first, identify the conditions and corresponding actions, determine the number of columns using the formula 2^n, and review for inconsistencies or redundancy. There are three main types of decision tables: Limited Entry DT (LEDT), Extended Entry DT (EEDT), and Mixed Entry DT (MEDT), each catering to different decision-making needs. This guide also includes practical examples to assist in comprehension.

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Understanding Decision Tables: Construction and Types for Effective Decision-Making

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  1. Decision Table Defined: • A decision table is a table composed of rows and columns, separated into four separate quadrants.

  2. Construction Rule for DT • 1. Identify the of conditions that may affect the decision. • 2. Identify the corresponding actions that may be taken in that decision situations. • Determine the no of columns ( 2 Raised to power n) • Fill Condition Entries ( Half Y and Half N) • Check the condition entries for inconsistancy,contradictions, redundancy • Use(X) for action being taken

  3. Q1 • A Mobile phone operator is running a promotional campaign. According to scheme the customer who make calls worth Rs.1000 in any calendar month is allowed 50% on all subsequent calls made to its own network during that month. Construct DT depicting the functioning such program.

  4. Conditions: • Bal >=1000 • Current Billing Month • On net calls Actions: • 50% Disc • No Disc

  5. Decision Table

  6. Q 2 • Vibrant traders is medium sized Co. the Co is in the process documenting payment procedures. The management has formulated following rule • All cheques should be signed by signitatories • Cheques up to Rs.100000 may be signed by two mgrs. • Cheques up to Rs.1.0 Million should be signed by at least one director. • Cheques of more than Rs.1.0 Million should be signed by at least one director Prepare DT to assist in the verification of cheques.

  7. Types of Dec Tables • Limited Entry DT • Extended Entry DT • Mixed Entry DT

  8. LEDT • In LEDT each condition is posed as a question requiring Y or N or immaterial answer and each action is taken or not. • All DT already discussed are LEDTs

  9. EEDT • In EEDT the conditions and actions the exact cond & action being specified in entry quadrant. • MEDT • Limited and extended with one table

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