SRS of Personal Investment Management System

Software Requirement
Specification (SRS) for Personal Investment Management System (PIMS)

1.  Introduction

1.1  Purpose:

Personal
Investment Management System (PIMS) is intended to help the user keep account
of his/her money invested in institutions such as Banks and Share Market.

This
document is meant to delineate the features of PIMS, so as to serve as a guide
to the developers on one hand and a software validation document for the
prospective client on the other.

1.2  Scope:

We
describe what features are in the scope of the software and what are not in the
scope of the software to be developed.

In
Scope:

a.      Managing investment of a single user,
which would include maintaining bookkeeping information about entities like
Portfolio, Security, and Transaction.

b.      Computation of Net-Worth and Rate of
Investment (ROI) of the Investor.

c.       Giving alerts to the user, if he requests
for one.

d.      Downloading the current prices of shares
from the web.

e.       User authentication.

Out of Scope:

a.      Features for actual purchasing and selling
of securities. That is, actually buying and selling of shares/securities is
done outside PIMS.

b.      Tax computations for gains/losses.

c.       Any market related prediction.

1.3  Definitions, Acronyms, and Abbreviations:

Acronyms and
Abbreviations:

a.      PIMS: Personal Investment Management
System.

b.      SRS: Software Requirements Specification.

c.       WWW: World Wide Web.

d.      GUI: Graphical User Interface.

e.       ROI: Rate of Investment.

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Definitions:

a.       Transaction: A real event that involves flow of
personal money. In the context of shares, it is buying/selling a group of
shares of the same company, and in context of Bank it is deposit/withdrawal of
money to/from one’s account.

b.      Security: A set of all transactions pertaining to a company share or a
bank account.

c.       Portfolio: A set of Securities.

d.      Net-Worth: The sum total of all the money of the
investor in form of shares and bank balances.

e.       ROI:
The interest that user gets on a particular investment. In the context of a
bank account it is the annual interest and in case of a company share it is
defined as given in appendix A:

1.4  References:

Appendix A: Formula for ROI calculation
for shares. Appendix B: Formula for Net-Worth calculation. Appendix C: User
Screens.

1.5  Overview:

The
rest of this SRS is organized as follows: Section 2 gives an overall
description of the software. It gives what level of proficiency is expected of
the user, some general constraints while making the software and some
assumptions and dependencies that are assumed. Section 3 gives specific
requirements which the software is expected to deliver. Functional requirements
are given by various use cases. Some performance requirements and design
constraints are also given. Section 4 gives some possible future extensions of
the system. Finally the appendices in Section 5 describe respectively the
formula for ROI calculation for shares and user screen.

2.  Overall Description:

2.1  Product Perspective:

PIMS is
aimed toward a person who has considerable number of investments in stock
market and banks, and so needs software assistance for book keeping and
computations regarding the investments. PIMS should be user-friendly, ‘quick to
learn’ and reliable software for the above purpose.

PIMS is
intended to be a stand-alone product and should not depend on the availability
of other software. It should run on both UNIX and Windows based platform.

2.2  Product Functions:

PIMS should support the following use
cases:

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2.3  User Characteristics:

a.      The user should be familiar with the
Investment Management related terminology like Portfolio/Security/Transaction.

b.      The user should know the details of a
transaction.

2.4  Principal Actors:

The two
principal actors in PIMS are “user” and “system”.

2.5  General Constraints:

a.      For full working PIMS requires Internet
connection.

b.      PIMS is single-user software.

2.6  Assumptions and Dependencies:

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a.       Full working of PIMS is dependent on the availability of
Internet connection.

b.      The downloading of share prices in PIMS is
customized to www.indiainfoline.com. PIMS would not work for any other
website.

c.       The company shares registered in the
National Stock Exchange (NSE) are only considered by PIMS.

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Specific
Requirements:

3.1  Functional Requirements:

We
describe the functional requirements by giving various use cases.

Use
case related to installation:

Use
Case 1: Installation

Primary Actor:
User

Pre Condition:
Internet connection available.

Main Scenario :

1.      User initiates PIMS installation program.

2.      System asks the user for the home
directory in which all the working files will be created. User is also asked
for the initial login and password.

3.      User specifies the home directory and
login/password.

4.     
System
creates the working files in the specified home directory. Working files
contain:

a.      Authorization information.

b.      List of company names.

c.       Current share prices.

d.      Investment structure.

5.      
System
downloads the list of companies (registered in NSE, from www.indiainfoline.com) and the current share
prices. It initializes the

files containing the list of companies and
the current share prices with the downloaded data.

Alternate Scenario:

5(a).
Network failure.

5(a)1.
Installation aborted.

Use
cases related to system authorization:

Use
Case 2: Login

Primary Actor:
User

Pre Condition:
Nil

Main Scenario
:

1.  Start the application. User prompted for
login and password.

2.  User gives the login and password.

3.  System does authentication.

4.  Main screen is displayed.

Alternate Scenario :

4(a).
Authorization fails

4(a)1.
Prompt the user that he typed the wrong password

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4(a)2. Allow him to re-enter the password.
Give him 3 chances.

Use Case 3: Change Password

Primary Actor:
User

Pre Condition:
User logged in

Main Scenario
:

1.  User initiates the password change
command.

2.   User is prompted for old password, new
password and confirm new password.

3.    User gives the old password, new password
and confirm new password.

4.  System does authentication.

5.  New password is registered with the
system.

Alternate Scenario :

4(a).
Authorization fails

4(a)1. Prompt the
user that he typed the wrong password 4(a)2. Allow him to re-enter the
password. Give him 3 chances.

4(b). New password
and confirm new password do not match. 4(b)1. Allow him to re-enter the
attributes. Give 3 chances.

Use cases related to portfolios:

Use Case 4: Create Portfolio

Primary Actor:
User

Pre Condition: User
logged in.

Main Scenario
:

1.  User initiates the “create portfolio”
functionality.

2.  System asks the user for the portfolio
name.

3.  User enters the portfolio name.

4.  An empty portfolio is created.

Alternate Scenario:

4(a).
Portfolio with the same name exists.

4(a)1. System asks
the user for a different name. 4(a)2. User enters a different name.

4(a)3.
Empty portfolio gets created.

Use
Case 5: Rename portfolio.

Primary Actor:
User

Pre-Condition:
User logged in.

Main Scenario
:

1.  User initiates the “rename portfolio”
functionality.

2.  System asks for the portfolio to be
renamed and the new name.

3.  User enters the new name.

4.  Portfolio is renamed.

Alternate
Scenario:

4(a).
The portfolio whose name is supposed to change does not exist.

4(a)1. Renaming
fails, the error message is displayed. 4(b). Portfolio with the same new name
exists.

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4(b)1. Renaming fails, the error message
is displayed.

Use Case 6: Delete portfolio.

Primary Actor:
User

Pre-Condition:
User logged in.

Main Scenario
:

1.  User initiates the ”delete portfolio”
functionality.

2.  System asks for the name of the portfolio.

3.  The portfolio is deleted.

Alternate Scenario:

3(a).
Portfolio does not exist.

3(a)1.
Deletion fails, error message is displayed.

Use cases related to securities:

Use Case 7: Create a security.

Primary Actor:
User

Pre-Condition:
User logged in.

Main Scenario
:

1.  User selects the portfolio in which the
security is to be created.

2.  User initiates the “create security”
functionality.

3.  System asks the user to enter the
attributes of the security.

4.  User specifies the following fields:

a.       Name

b.      Type: bank or share.

c.       Rate of interest: if the type is bank.

d.     
Company
name: if the type is share. Choosing the
company from a list companies does this. (Companies registered in the
National Stock Exchange, names downloaded at the installation time. Refer use
case 1)

5.  An empty security of specified attributes
is created.

Alternate Scenario:

5(a)
A security with the given name already exists.

5(a)1.
Security creation fails, error message is displayed.

Use
Case 8: Rename security.

Primary Actor:
User

Pre-Condition:
User logged in.

Main Scenario
:

1.  User selects the portfolio.

2.  User initiates the “rename security”
functionality.

3.  System asks the user for the security and
the new name.

4.  User enters the security name and the new
name.

5.  Name is changed.

Alternate Scenario:

5(a). The security
whose name is supposed to change does not exist. 5(a)1. Renaming fails, the
error message is displayed.

5(b).
Security with the same new name exists.

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5(b)1. Renaming fails, the error message
is displayed.

Use Case 9: Delete security.

Primary Actor:
User

Pre-Condition:
User logged in.

Main Scenario
:

1.  User selects the portfolio.

2.  User initiates the “delete security”
functionality.

3.  System asks for the security name.

4.  Security is deleted.

Alternate Scenario

4(a).
Security does not exist.

4(a)1.
Deletion fails, error message is displayed.

Use cases related to transactions:

Use Case 10: Adding a transaction.

Primary Actor:
User.

Pre-Condition:
User logged in.

Main Scenario
:

1.  User selects the portfolio and the
security.

2.  User initiates the “add transaction”
functionality.

3.  System prompts the user for following
details, depending on the security type

(i)If
the security is of share type:

a.      Number of shares transacted

b.      Type of transaction: buy or sell

c.       Price of one share

d.      Date of transaction

e.       Any detail user might want to enter.

(ii)If
the security is of bank type:

a.      Amount of money transacted

b.      Type of transaction: credit or debit.

c.       Date of transaction

d.      Any detail user might want to enter.

4.
New transaction is created.

Alternate Scenario:

4(a). Invalid
attribute value is entered. For example field (i)(a) is not an integer or
(i)(c) is not a float.

4(a)1. User is
shown the error displayed and prompted to enter the incorrect fields again.

Use Case 11: Editing a transaction.

Primary Actor:
User.

Pre-Condition:
User logged in.

Main Scenario
:

1.
User selects the portfolio, security and transaction.

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2.  User initiates the “edit transaction”
functionality.

3.  System asks the user to enter new fields
for the transaction. The fields are the same as given in Use case 1.

4.  The modified transaction is saved.

Alternate Scenario:

4(a). Invalid
attribute value entered. For example field (i)(a) is not an integer or (i)(c)
is not a float.

4(a)1. User is
shown the error displayed and prompted to enter the incorrect fields again.

Use Case 12: Deleting a transaction.

Primary Actor:
User.

Pre-Condition:
User logged in.

Main Scenario
:

1.  User specifies the portfolio, security and
transaction.

2.  User initiates the “delete transaction”
functionality.

3.  The transaction is deleted.

Use cases related to information display:

Use Case 13: Display Investment

Primary Actor:
User.

Pre-Condition:
User logged in.

Main Scenario:

1.      User selects the option of viewing the
Investment (from the left pane, refer user screens in Appendix C).

2.       System computes the net worth for each portfolio. Refer use
case 16.

3.      System displays the name of all portfolios
with their net-worth. It also shows the net-worth of entire investment by
adding up the net-worth of each portfolio.

Use
Case 14: Display Portfolio

Primary Actor:
User

Pre-Condition:
User logged in.

Main Scenario:

1.      
User
selects the option of viewing a particular portfolio (selects a portfolio from
the left pane, refer user screens in Appendix A).

2.     
System
computes the net-worth and ROI of each security. Refer use cases 16 and 17.

3.      System displays the securities in the
portfolio with the net-worth and ROI computed. It also displays the net-worth
of the portfolio by summing up the net-worth of each security.

Use
Case 15: Display Security

Primary Actor:
User

Pre-Condition:
User logged in.

Main Scenario:

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1.      
User
selects the option of viewing a particular security (selects a portfolio from
the left pane, refer user screens in Appendix C).

2.      System displays all the transactions.

Use cases related to computations

Use
Case 16: Compute Net-Worth.

Primary Actor:
System.

Pre-Condition:
User logged in & investment/portfolio/security specified

Main Scenario
:

1.      System computes net-worth for
investment/portfolio/security specified (Appendix B shows the detailed method
for computing the net-worth).

Use
Case 17: Compute Rate of
Investment.

Primary Actor:
System.

Pre-Condition:
User logged in & security specified

Main Scenario
:

1.  System computes ROI for the security
specified (Appendix A shows the detailed method for computing the ROI).

Use
cases related to share prices

Use
Case 18: Getting the current prices of shares.

Primary Actor:
User.

Pre-Condition:
User logged in and internet connection exists.

Main Scenario
:

1. User initiates the “download current
prices” functionality.

2.    The system downloads the current share
prices from a particular

website.

Alternate Scenario:

2(a).
Not able to download (due to network failure, site down, …)

1.
Display current value saved from before; ask the user to change it

Use
Case 19: Editing the share prices.

Primary Actor:
User.

Pre-Condition:
User logged in.

Main Scenario
:

1.  User initiates the “Edit share prices”
functionality.

2.  The system shows the list of all the
companies and their current share prices (as known to the system).

3.  User edits the price of the company share
he wants to edit.

Alternate Scenario:

3(a).
The entered price is invalid.

3(a)(i)
User is shown the error displayed.

3(b).
The company name does not exist in the list of companies

3(b)1. This is not
handled by PIMS. PIMS is customized for the 760-800 odd companies registered in
the NSE.

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Use cases related to alerts

Use
Case 20: Setting alerts

Primary Actor:
User.

Pre-Condition:
User logged in.

Main Scenario
:

1. User initiates the “set alert”
functionality.

2.  The system asks the user for the date and
details of the alert.

3.  The alert is set.

Use
Case 21: Show the pending
alerts.

Primary Actor:
User.

Pre-Condition:
User logged in.

Main Scenario
:

1.  User initiates the “show pending alerts”
functionality.

2.  System shows the pending alerts.

Use
Case 22: Delete alerts.

Primary Actor:
User.

Pre-Condition: User
logged in.

Main Scenario
:

1.  User initiates the “delete alerts”
functionality.

2.  User is asked for the alert to be deleted.

3.  The alert is deleted.

3.2  Performance Requirements:

(a)   Should run on 500 MHz, 64 MB machine.

(b)   90% of the responses should be within 2
sec, except for downloading current prices for which more time is acceptable.

3.3  Design Constraints:

1.
Security: The files in which the information regarding securities and
portfolios should be secured against malicious deformations.

2. Fault Tolerance: Data should not
become corrupted in case of system crash or power failure.

3.4  External Interface Requirements:

The user screen is split vertically into
two panes. The left pane contains the Investment tree, which expands and
contracts as per user action. The right part displays the information related
to investment/portfolio/security that is specified on the left pane. Appendix B
shows the intended user screen.

4.      Future Extensions:

a.
PIMS is intended to be a single user software. A possible future extension
would be to make it multi user.

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5.  Appendix

5.1  Appendix A:

The
formula for calculation of ROI for shares:

Suppose that, for the share of a
particular company, following were the attributes of ith transaction.

Amount
of money transacted = mi

Time between date
of transaction and day when ROI is being calculated = ni Type of transaction = buy or sell

Let sgn(i) =
+1 if the transaction was a buy, and -1 if it was a sell. Then, the rate of
investment, r, is got by solving the equation

S sgn(i) mi (1+r) ni     = M

where
M is the total amount in that share, and summation is over all the
transactions.

The
formula for calculation of ROI for banks:

For a
banks the ROI is constant, namely the interest rate of that bank.

5.2
Appendix B:

The
formula for calculating net-worth of a security:

If the
security is of type “share”:

Net-worth = C*N where C is the current
value of the share of the security and N is the number of shares of that
security which the user has.

If the security is of type “bank”, the
net-worth is simply the total balance of money in that bank.

The
formula for calculating net-worth of a portfolio:

Net
worth of a security = S Net-worth of ith security.

( where
the summation ranges over all the securities.)

The
formula for calculating net-worth of entire investment:

Net
worth of entire investment = S
Net-worth
of
ith
portfolio.
( where the summation ranges over all
the portfolios.)