How top manager can get lower level employees involved in the business improvement processes without releasing sensitive information?

Two quick observations first.   If the relationship between junior staff and management is good, then the staff are usually pretty trustworthy.  Tell them something is confidential, and tell them what to do if something is inadvertently revealed, and most of the time it won't be.  Secondly, senior management are usually much too cautious about revealing "sensitive" information. 

In other words, start by being a bit more trusting and a bit less paranoid.

Now, the heart of the matter.  Once you have identified the key areas in which you want improvement, you can ask the staff specific questions.   The more specific you can be about the questions you ask, the less sensitive information you will have to release.   The staff don't need to know how you figured out some particular thing is important.

By holding a training class and upgrading the subordinate personnel

من خلال اشراكهم بدورات تعتمد صميم عملهم في الداخل او الخارج

No, We were all on the same salary bracket.

Because they are very close to final customer

1. Establish Clear Communication Channels: Provide formal and informal channels for communication between different management levels. Encourage employees to freely share their ideas and feedback. 2. Provide Information Without Revealing Sensitive Details: Offer a general overview of challenges or goals for business improvement. Use general data and statistics when needed without disclosing confidential information. 3. Delegate Tasks: Assign employees specific tasks within their areas of expertise. Empower them to make decisions within clearly defined boundaries. 4. Rely on Diverse Work Teams: Form teams from various organizational levels to work on specific improvement projects. Foster interaction among team members to exchange ideas and expertise. 5. Encourage Innovation: Motivate employees to think creatively and propose new solutions. Offer rewards or incentives for the best implemented ideas. 6. Provide Training and Guidance: Organize workshops or training sessions to introduce employees to business improvement concepts. Guide them on how to contribute effectively and securely. 7. Create a Mechanism to Evaluate and Implement Ideas: Design a system to evaluate submitted ideas and select the most viable ones. Involve employees in monitoring the implementation of these ideas and measuring their impact. 8. Build Trust: Foster a culture of trust and transparency within the organization. Emphasize the importance of each employee's role in achieving the organization's overall success. 9. Utilize Technology: Adopt digital tools for communication and collaboration, such as suggestion platforms or internal apps. By following these steps, a top manager can effectively engage lower-level employees in business improvement initiatives while safeguarding sensitive information.

Reminding the general vision and mission of Company as the goal of all team members include him/her, giving the logical reward of her/his achievement by listening their ideas as a continuous improvement for his/her performance and company's goals.

Two expert expressed very good opinion, i learned from them a very good lesson. Thanks experts & 1 one who posted the question.

I totally agree with mr. Duncan Robertson's good submission, another approach or perspective can be. Train & develop these employees as far as preparing them for this project is concerned. They should acquire the relevant & necessary information & skills for this particular project- don't let them be "caught offside". Study the employees & their profiles to be able to know & understand what you are getting into or what you are handling exactly. Mentor these employees showing them what their specific roles & are responsibilities, how important the project is & how important their efforts arevin this project. Motivate them & prepare corresponding appraisal exercise to reward their efforts. Disclose only the relevant & necessary information to their disposal.

Every person have a ability to do something new. so i make sure that i do that.