REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS

To the Board of Directors of Calvert Variable Series, Inc. and

Shareholders of Calvert Social International Equity Portfolio:

In planning and performing our audit of the financial statements of Calvert Social International Equity Portfolio, (one of the portfolios comprising Calvert Variable Series, Inc., hereafter referred to as the "Fund"),for the year ended December 31, 2001, we considered its internal control, including control activities for safeguarding securities, in order to determine our auditing procedures for the purpose of expressing our opinion on the financial statements and to comply with the requirements of Form N-SAR, not to provide assurance on internal control.

The management of the Fund is responsible for establishing and maintaining internal control. In fulfilling this responsibility, estimates and judgments by management are required to assess the expected benefits and related costs of controls. Generally, controls that are relevant to an audit pertain to the entity's objective of preparing financial statements for external purposes that are fairly presented in conformity with accounting principles generally accepted in the United States. Those controls include the safeguarding of assets against unauthorized acquisition, use, or disposition.

Because of inherent limitations in internal control, error or fraud may occur and not be detected. Also, projection of any evaluation of internal control to future periods is subject to the risk that it may become inadequate because of changes in conditions or that the effectiveness of the design and operation may deteriorate.

Our consideration of internal control would not necessarily disclose all matters in internal control that might be material weaknesses under standards established by the American Institute of Certified Public Accountants. A material weakness is a condition in which the design or operation of one or more of the internal control components does not reduce to a relatively low level the risk that misstatements caused by error or fraud in amounts that would be material in relation to the financial statements being audited may occur and not be detected within a timely period by employees in the normal course of performing their assigned functions. However, we noted no matters involving internal control and its operation, including controls for safeguarding securities, that we consider to be material weaknesses as defined above as of December 31, 2001.

This report is intended solely for the information and use of management and the Board of Directors of Calvert Variable Series, Inc. and Shareholders of Calvert Social International Equity Portfolio and the Securities and Exchange Commission and is not intended to be and should not be used by anyone other than these specified parties.

ARTHUR ANDERSEN LLP

Philadelphia, Pennsylvania

February 15, 2002

REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS

To the Board of Directors of Calvert Variable Series, Inc. and

Shareholders of Calvert Social Mid Cap Growth Portfolio:

In planning and performing our audit of the financial statements of Calvert Social Mid Cap Growth Portfolio, (one of the portfolios comprising Calvert Variable Series, Inc., hereafter referred to as the "Fund"),for the year ended December 31, 2001, we considered its internal control, including control activities for safeguarding securities, in order to determine our auditing procedures for the purpose of expressing our opinion on the financial statements and to comply with the requirements of Form N-SAR, not to provide assurance on internal control.

The management of the Fund is responsible for establishing and maintaining internal control. In fulfilling this responsibility, estimates and judgments by management are required to assess the expected benefits and related costs of controls. Generally, controls that are relevant to an audit pertain to the entity's objective of preparing financial statements for external purposes that are fairly presented in conformity with accounting principles generally accepted in the United States. Those controls include the safeguarding of assets against unauthorized acquisition, use, or disposition.

Because of inherent limitations in internal control, error or fraud may occur and not be detected. Also, projection of any evaluation of internal control to future periods is subject to the risk that it may become inadequate because of changes in conditions or that the effectiveness of the design and operation may deteriorate.

Our consideration of internal control would not necessarily disclose all matters in internal control that might be material weaknesses under standards established by the American Institute of Certified Public Accountants. A material weakness is a condition in which the design or operation of one or more of the internal control components does not reduce to a relatively low level the risk that misstatements caused by error or fraud in amounts that would be material in relation to the financial statements being audited may occur and not be detected within a timely period by employees in the normal course of performing their assigned functions. However, we noted no matters involving internal control and its operation, including controls for safeguarding securities, that we consider to be material weaknesses as defined above as of December 31, 2001.

This report is intended solely for the information and use of management and the Board of Directors of Calvert Variable Series, Inc. and Shareholders of Calvert Social Mid Cap Growth Portfolio and the Securities and Exchange Commission and is not intended to be and should not be used by anyone other than these specified parties.

ARTHUR ANDERSEN LLP

Philadelphia, Pennsylvania

February 15, 2002

REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS

To the Board of Directors of Calvert Variable Series, Inc. and

Shareholders of Calvert Social Money Market Portfolio:

In planning and performing our audit of the financial statements of Calvert Social Money Market Portfolio, (one of the portfolios comprising Calvert Variable Series, Inc., hereafter referred to as the "Fund"),for the year ended December 31, 2001, we considered its internal control, including control activities for safeguarding securities, in order to determine our auditing procedures for the purpose of expressing our opinion on the financial statements and to comply with the requirements of Form N-SAR, not to provide assurance on internal control.

The management of the Fund is responsible for establishing and maintaining internal control. In fulfilling this responsibility, estimates and judgments by management are required to assess the expected benefits and related costs of controls. Generally, controls that are relevant to an audit pertain to the entity's objective of preparing financial statements for external purposes that are fairly presented in conformity with accounting principles generally accepted in the United States. Those controls include the safeguarding of assets against unauthorized acquisition, use, or disposition.

Because of inherent limitations in internal control, error or fraud may occur and not be detected. Also, projection of any evaluation of internal control to future periods is subject to the risk that it may become inadequate because of changes in conditions or that the effectiveness of the design and operation may deteriorate.

Our consideration of internal control would not necessarily disclose all matters in internal control that might be material weaknesses under standards established by the American Institute of Certified Public Accountants. A material weakness is a condition in which the design or operation of one or more of the internal control components does not reduce to a relatively low level the risk that misstatements caused by error or fraud in amounts that would be material in relation to the financial statements being audited may occur and not be detected within a timely period by employees in the normal course of performing their assigned functions. However, we noted no matters involving internal control and its operation, including controls for safeguarding securities, that we consider to be material weaknesses as defined above as of December 31, 2001.

This report is intended solely for the information and use of management and the Board of Directors of Calvert Variable Series, Inc. and Shareholders of Calvert Social Money Market Portfolio and the Securities and Exchange Commission and is not intended to be and should not be used by anyone other than these specified parties.

ARTHUR ANDERSEN LLP

Philadelphia, Pennsylvania

February 15, 2002

REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS

To the Board of Directors of Calvert Variable Series, Inc. and

Shareholders of Calvert Social Small Cap Growth Portfolio:

In planning and performing our audit of the financial statements of Calvert Social Small Cap Growth Portfolio, (one of the portfolios comprising Calvert Variable Series, Inc., hereafter referred to as the "Fund"),for the year ended December 31, 2001, we considered its internal control, including control activities for safeguarding securities, in order to determine our auditing procedures for the purpose of expressing our opinion on the financial statements and to comply with the requirements of Form N-SAR, not to provide assurance on internal control.

The management of the Fund is responsible for establishing and maintaining internal control. In fulfilling this responsibility, estimates and judgments by management are required to assess the expected benefits and related costs of controls. Generally, controls that are relevant to an audit pertain to the entity's objective of preparing financial statements for external purposes that are fairly presented in conformity with accounting principles generally accepted in the United States. Those controls include the safeguarding of assets against unauthorized acquisition, use, or disposition.

Because of inherent limitations in internal control, error or fraud may occur and not be detected. Also, projection of any evaluation of internal control to future periods is subject to the risk that it may become inadequate because of changes in conditions or that the effectiveness of the design and operation may deteriorate.

Our consideration of internal control would not necessarily disclose all matters in internal control that might be material weaknesses under standards established by the American Institute of Certified Public Accountants. A material weakness is a condition in which the design or operation of one or more of the internal control components does not reduce to a relatively low level the risk that misstatements caused by error or fraud in amounts that would be material in relation to the financial statements being audited may occur and not be detected within a timely period by employees in the normal course of performing their assigned functions. However, we noted no matters involving internal control and its operation, including controls for safeguarding securities, that we consider to be material weaknesses as defined above as of December 31, 2001.

This report is intended solely for the information and use of management and the Board of Directors of Calvert Variable Series, Inc. and Shareholders of Calvert Social Small Cap Growth Portfolio and the Securities and Exchange Commission and is not intended to be and should not be used by anyone other than these specified parties.

ARTHUR ANDERSEN LLP

Philadelphia, Pennsylvania

February 15, 2002

REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS

To the Board of Directors and

Shareholders of Calvert Variable Series, Inc. Ameritas Portfolios:

In planning and performing our audit of the financial statements of Calvert Variable Series, Inc. Ameritas Portfolios (comprised of Income & Growth, Growth, Small Capitalization, MidCap Growth, Emerging Growth, Research, Growth with Income, Index 500, Money Market, Select, and Micro Cap Portfolios, hereafter referred to as the "Funds"),for the year ended December 31, 2001, we considered its internal control, including control activities for safeguarding securities, in order to determine our auditing procedures for the purpose of expressing our opinion on the financial statements and to comply with the requirements of Form N-SAR, not to provide assurance on internal control.

The management of the Funds is responsible for establishing and maintaining internal control. In fulfilling this responsibility, estimates and judgments by management are required to assess the expected benefits and related costs of controls. Generally, controls that are relevant to an audit pertain to the entity's objective of preparing financial statements for external purposes that are fairly presented in conformity with accounting principles generally accepted in the United States. Those controls include the safeguarding of assets against unauthorized acquisition, use, or disposition.

Because of inherent limitations in internal control, error or fraud may occur and not be detected. Also, projection of any evaluation of internal control to future periods is subject to the risk that it may become inadequate because of changes in conditions or that the effectiveness of the design and operation may deteriorate.

Our consideration of internal control would not necessarily disclose all matters in internal control that might be material weaknesses under standards established by the American Institute of Certified Public Accountants. A material weakness is a condition in which the design or operation of one or more of the internal control components does not reduce to a relatively low level the risk that misstatements caused by error or fraud in amounts that would be material in relation to the financial statements being audited may occur and not be detected within a timely period by employees in the normal course of performing their assigned functions. However, we noted no matters involving internal control and its operation, including controls for safeguarding securities, that we consider to be material weaknesses as defined above as of December 31, 2001.

This report is intended solely for the information and use of management and the Board of Directors and Shareholders of Calvert Variable Series, Inc. Ameritas Portfolios and the Securities and Exchange Commission and is not intended to be and should not be used by anyone other than these specified parties.

ARTHUR ANDERSEN LLP

Philadelphia, Pennsylvania

February 15, 2002

REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS

To the Board of Directors of Calvert Variable Series, Inc. and

Shareholders of Calvert Social Balanced Portfolio:

In planning and performing our audit of the financial statements of Calvert Social Balanced Portfolio, (one of the portfolios comprising The Calvert Variable Series, Inc., hereafter referred to as the "Fund"),for the year ended December 31, 2001, we considered its internal control, including control activities for safeguarding securities, in order to determine our auditing procedures for the purpose of expressing our opinion on the financial statements and to comply with the requirements of Form N-SAR, not to provide assurance on internal control.

The management of the Fund is responsible for establishing and maintaining internal control. In fulfilling this responsibility, estimates and judgments by management are required to assess the expected benefits and related costs of controls. Generally, controls that are relevant to an audit pertain to the entity's objective of preparing financial statements for external purposes that are fairly presented in conformity with accounting principles generally accepted in the United States. Those controls include the safeguarding of assets against unauthorized acquisition, use, or disposition.

Because of inherent limitations in internal control, error or fraud may occur and not be detected. Also, projection of any evaluation of internal control to future periods is subject to the risk that it may become inadequate because of changes in conditions or that the effectiveness of the design and operation may deteriorate.

Our consideration of internal control would not necessarily disclose all matters in internal control that might be material weaknesses under standards established by the American Institute of Certified Public Accountants. A material weakness is a condition in which the design or operation of one or more of the internal control components does not reduce to a relatively low level the risk that misstatements caused by error or fraud in amounts that would be material in relation to the financial statements being audited may occur and not be detected within a timely period by employees in the normal course of performing their assigned functions. However, we noted no matters involving internal control and its operation, including controls for safeguarding securities, that we consider to be material weaknesses as defined above as of December 31, 2001.

This report is intended solely for the information and use of management and the Board of Directors of Calvert Variable Series, Inc. and Shareholders of Calvert Social Balanced Portfolio and the Securities and Exchange Commission and is not intended to be and should not be used by anyone other than these specified parties.

ARTHUR ANDERSEN LLP

Philadelphia, Pennsylvania

February 15, 2002