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  Tabular Design Notation

Introduction to Tabular Design Notation

Decision tables provide a notation that translates action and conditions (described in a  processing narrative ) into a tabular form. The table  is difficult  to misinterpret and may  even be used as a machine readable input to a table  driven algorithm.  Referring to the  fig 5.33,double  lines divide the table  into four  sections. The upper left hand  section contains a list of all conditions whereas lower left hand section contains al of all possible actions on combinations of conditions. The right hand sections form a matrix to  indicate condition combination  and the corresponding  actions that will occur for a specific combination. Therefore each column of the matrix may  be interpreted as processing rule.

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The followings  steps are applied to develop a decision  table:

1. List all  action that can be associated with a specific procedure ( or Module) .

2. List all conditions ( or decision made ) during  execution of the  procedure.

3. Associate specific sets of conditions with specific actions eliminating  impossible combinations of conditions alternatively  develop every  possible permutation of conditions.

4. Define  rules by indicating what  actions occur for a set  of conditions.

Program Design Language

Program Design Language (PDL)  is also called as structured English  or pseudo code. PDL is used as a generic reference  for a design language.  The  difference between PDL and a real high order programming language lies in the use of narrative text (example English )  embedded directly into a syntactical structure. PDL can not  be compiled ( at least not yet). However  PDL processors currently exist to translate PDL into  a graphical  representation ( example a flow chart ) of design and produce nesting maps a design  operation index cross reference tables and a variety of other information. A  design  language should  have the following characteristics:

1. A fixed syntax of keywords that  provide  for all structured constructs data  declaration, and modularity characteristics.

2. A free syntax of natural  language that  describes processing features.

3. Data declaration facilities that should include both simple ( scalar array ) and complex ( linked  list or tree) data  structures.

Subprogram definition and calling techniques that support  various modes of interface description.

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