Produce a high$-$level designs $($HLD$)$ document of a Customer Relationship Management $($CRM$)$ System. This document should have a minimum of ten pages.

Please conform to the typical HLD document convention.

For example, the document should have a table of contents such as this that has the same general topics and subtopics:

$1.$ Introduction

$1\mathrm{.}1.$ Why this High Level Design Document?

$1\mathrm{.}2.$ Scope

$1\mathrm{.}3.$ Definitions

$1\mathrm{.}4.$ Overview

$2.$ General Description

$2\mathrm{.}1.$ Product Perspective

$2\mathrm{.}2.$ Tools used

$2\mathrm{.}3.$ General Constraints

$2\mathrm{.}4.$ Assumptions

$2\mathrm{.}5.$ Special Design aspects

$3.$ Design Details

$3\mathrm{.}1.$ Main Design Features

$3\mathrm{.}2.$ Application Architecture

$3\mathrm{.}3.$ Technology Architecture

$3\mathrm{.}3\mathrm{.}1.$ Web Application Architecture

$3\mathrm{.}3\mathrm{.}2.$ Presentation Layer

$3\mathrm{.}3\mathrm{.}3.$ Data Access Layer

$3\mathrm{.}3\mathrm{.}4.$ Tools Used

$3\mathrm{.}4.$ Standards

$3\mathrm{.}5.$ Database design

$3\mathrm{.}6.$ Files

$3\mathrm{.}7.$ User Interface

$3\mathrm{.}8.$ Reports

$3\mathrm{.}9.$ Error Handling

$3\mathrm{.}10.$ Interfaces

$3\mathrm{.}11.$ Help

$3\mathrm{.}12.$ Performance

$3\mathrm{.}13.$ Security

$3\mathrm{.}14.$ Reliability

$3\mathrm{.}15.$ Maintainability

$3\mathrm{.}16.$ Portability

$3\mathrm{.}17.$ Reusability

$3\mathrm{.}18.$ Application compatibility

$3\mathrm{.}19.$ Resource utilization

$3\mathrm{.}20.$ Major Classes

Assessment Criteria

$71+$ marks

Suggested system meets requirements

Excellent documentation

Excellent research and presentation

$50-70$ marks

Suggested system meets most requirements

Good documentation

Good research and presentation

$0-49$ marks

Suggested system fails to meet most requirements

Poor documentation

Poor research and presentation HLD $1$: System Architecture HLD$2$: Customer Data Flow HLD$3$: Sales Process Flow