Development Process for Web-Enabled Applications – Low-Level Design

Low Level Design

Objective

The objective is to prepare Low Level Design (LLD) based on the High Level Design (HLD) document and Software Requirement Specifications (SRS) document. This stage also involves updating the draft version of various manuals prepared during HLD phase, writing Unit Test Plans (UTP) and to get approval for all of these from Quality Assurance (QA).

Entry Criteria

Low Level Design Process starts when:

· Approved High Level Design Document is available

· Updated Project Plan (PP) along with Configuration Management Plan (CM) is available

· Approved System Test Plans are available

· Outline of User Manual and System Manual is available

Process Description

Low Level Design focuses on refinements to the architectural representation laid down by the High Level Design. The various activities carried out during a Low Level Design are given below.

· Convert the Logical Data items identified during HLD into the corresponding physical data structures and identify the operations performed on them.

· Prepare the procedural Specification including algorithmic details

· Specify the logic for each unit / module of the software using Pseudocode / English.

· Prepare the Low Level Design document

· Prepare Unit Test Plans. Refer to the Unit Testing phase for more details

· The QA personnel and the client along with the project team should review the LLD document and the Unit Test plan. The review checklist for LLD document appears in procedure MT/TECH/FTR.

· Update the LLD document and Unit Test Plan based on the review results

· Update the Project Plan and CM.

Note: When Prototyping methodology is followed for design and development, there is no activity correspond to the Low Level Design phase (detailed design). That is, upon finishing a quick design (corresponding to High Level Design) the development (code & unit test) phase is started immediately.

Deliverables from the process

· Reviewed and approved LLD Document

· Reviewed and updated Project Plan

· Unit Test Plans

· Updated version of User manual, System manual and Trouble shooting guide

Exit Criteria

The LLD process is completed when:

· Reviewed and approved Low Level Design document available

· Reviewed and approved Project Plan available

· Reviewed and approved Unit Test Plan documents available

Coding

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