What should be the nature of the relationship between the business plan and the IS plan?

Let us just first define the business plan and the Information System plan enable for us to understand it clearly.

Business Plan

A business plan is a formal statement of a set of business goals, the reasons why they are believed attainable, and the plan for reaching those goals. It may also contain background information about the organization or team attempting to reach those goals.

The business goals may be defined for for-profit or for non-profit organizations. For-profit business plans typically focus on financial goals, such as profit or creation of wealth. Non-profit and government agency business plans tend to focus on organizational mission which is the basis for their governmental status or their non-profit, tax-exempt status, respectively—although non-profits may also focus on optimizing revenue. In non-profit organizations, creative tensions may develop in the effort to balance mission with "margin" (or revenue). Business plans may also target changes in perception and branding by the customer, client, tax-payer, or larger community. A business plan having changes in perception and branding as its primary goals is called a marketing plan.

Business plans are decision-making tools. There is no fixed content for a business plan. Rather the content and format of the business plan is determined by the goals and audience. A business plan should contain whatever information is needed to decide whether or not to pursue a goal.

For example, a business plan for a non-profit might discuss the fit between the business plan and the organization’s mission. Banks are quite concerned about defaults, so a business plan for a bank loan will build a convincing case for the organization’s ability to repay the loan. Venture capitalists are primarily concerned about initial investment, feasibility, and exit valuation. A business plan for a project requiring equity financing will need to explain why current resources, upcoming growth opportunities, and sustainable competitive advantage will lead to a high exit valuation.

Preparing a business plan draws on a wide range of knowledge from many different business disciplines: finance, human resource management, intellectual property management, supply chain management, operations management, and marketing, among others. It can be helpful to view the business plan as a collection of sub-plans, one for each of the main business disciplines.

"... a good business plan can help to make a good business credible, understandable, and attractive to someone who is unfamiliar with the business. Writing a good business plan can’t guarantee success, but it can go a long way toward reducing the odds of failure."

resources: http://en.wikipedia.org/wiki/Business_plan

Information System Plan

In a very broad sense, the term information system is frequently used to refer to the interaction between people, processes, data and technology. In this sense, the term is used to refer not only to the information and communication technology (ICT) an organization uses, but also to the way in which people interact with this technology in support of business processes.

Some make a clear distinction between information systems, ICT and business processes. Information systems are distinct from information technology in that an information system is typically seen as having an ICT component. Information systems are also different from business processes. Information systems help to control the performance of business processes.

Alter argues for an information system as a special type of work system. A work system is a system in which humans and/or machines perform work using resources (including ICT) to produce specific products and/or services for customers. An information system is a work system whose activities are devoted to processing (capturing, transmitting, storing, retrieving, manipulating and displaying)information.

Part of the difficulty in defining the term information system is due to vagueness in the definition of related terms such as system and information. Beynon-Davies argues for a clearer terminology based in systemics and semiotics. He defines an information system as an example of a system concerned with the manipulation of signs. An information system is a type of socio-technical system. An information system is a mediating construct between actions and technology.

As such, information systems inter-relate with data systems on the one hand and activity systems on the other. An information system is a form of communication system in which data represent and are processed as a form of social memory. An information system can also be considered a semi-formal language which supports human decision making and action.

Information systems are the primary focus of study for the information systems discipline and for organizational informatics.

resources: http://en.wikipedia.org/wiki/Information_system

Conclusion:

My conclusion about the relationship of business plan to information system plan, as what stated above the business plan is a set of goals on how they will achieve those goals while the information system plan is developing strategy and plans for aligning information system with the business strategy of an organization. The business plan is a whole plan why that company was found what was the purpose the goal of the company, another is the plan or the strategic plan of the company on how to achieve their goal while the information system plan is a tool on which it can help to achieve the goal of the company in an effective way that the company can easily identify what to do or how they will make a move to reach their goals.