Strategic planning of information systems (IS) has become a significant topic for researchers and practitioners in IS development and IT implementation in business systems. Recent studies show that the impact of IT on business effectiveness is less than expected, indicating that IS/IT development is not solely the responsibility of IT professionals but also a key concern for top management. The paper hypothesizes that the efficiency of IT implementation depends on strategic planning of IS. To improve IT investment efficiency, new proposals and guidelines are provided. There is a clear disagreement between management and system analysts about what constitutes a good IS. IS/IT professionals often prioritize the latest technology, while management focuses on profitability and long-term benefits. The main challenge is balancing these criteria, with management emphasizing profitability and IS/IT professionals focusing on technical aspects. This discrepancy highlights the need for a unified approach to IS/IT planning. The paper discusses the importance of aligning IS/IT planning with business strategy. It emphasizes the need for a long-term strategic approach to IS development, considering business objectives, processes, and technology. The paper also highlights the role of CASE-tools in supporting strategic planning, noting their ability to formalize methods and techniques for IS/IT strategy planning and aid in the development of complex systems. The paper outlines the process of IS/IT strategic planning, emphasizing the need for a structured approach that involves defining IT strategy, aligning with business strategy, and ensuring that IS/IT investments contribute to organizational goals. It also discusses the importance of evaluating the impact of IS/IT on business performance and the role of different IS types in achieving strategic objectives. The paper concludes that effective IS/IT strategic planning requires a comprehensive approach that integrates business and technical considerations. It emphasizes the need for a structured process, the use of appropriate methods and tools, and the alignment of IS/IT strategies with business goals. The paper also highlights the importance of continuous evaluation and adaptation to ensure that IS/IT investments contribute to organizational success.Strategic planning of information systems (IS) has become a significant topic for researchers and practitioners in IS development and IT implementation in business systems. Recent studies show that the impact of IT on business effectiveness is less than expected, indicating that IS/IT development is not solely the responsibility of IT professionals but also a key concern for top management. The paper hypothesizes that the efficiency of IT implementation depends on strategic planning of IS. To improve IT investment efficiency, new proposals and guidelines are provided. There is a clear disagreement between management and system analysts about what constitutes a good IS. IS/IT professionals often prioritize the latest technology, while management focuses on profitability and long-term benefits. The main challenge is balancing these criteria, with management emphasizing profitability and IS/IT professionals focusing on technical aspects. This discrepancy highlights the need for a unified approach to IS/IT planning. The paper discusses the importance of aligning IS/IT planning with business strategy. It emphasizes the need for a long-term strategic approach to IS development, considering business objectives, processes, and technology. The paper also highlights the role of CASE-tools in supporting strategic planning, noting their ability to formalize methods and techniques for IS/IT strategy planning and aid in the development of complex systems. The paper outlines the process of IS/IT strategic planning, emphasizing the need for a structured approach that involves defining IT strategy, aligning with business strategy, and ensuring that IS/IT investments contribute to organizational goals. It also discusses the importance of evaluating the impact of IS/IT on business performance and the role of different IS types in achieving strategic objectives. The paper concludes that effective IS/IT strategic planning requires a comprehensive approach that integrates business and technical considerations. It emphasizes the need for a structured process, the use of appropriate methods and tools, and the alignment of IS/IT strategies with business goals. The paper also highlights the importance of continuous evaluation and adaptation to ensure that IS/IT investments contribute to organizational success.