Hello.. i'm new to project management here is my first question Why there are no scope,schedule and cost processes in Executing process group?

Taking a crack at this, I would say scope, scheduling, and cost have to do more with the initiating/planning phase.

The triple constraints describe the key areas that need to monitored for any risks or issues throwing off the balance within those factors of the project.

Execution is where you direct, manage, and implement actions to do the work.

** Critique me if I stand incorrect anywhere. I like to answer questions as a form of practice. :)

yeah but can i say executing processes are there to support triple constraints to create value and quality that reflects customer satisfaction? correct me if any

Word of warning to new PM's... the Process Groups are not the same thing as project phases. Sadly, the names sound similar but they are not the same.

Phases are time periods in your project where you accomplish a significant deliverable. Phase names are usually determined by your organization's (or industry's) methodology. They could be called Phase A, B, C, and D or Red, White, Blue, and Green. The names of the phases are entirely up to the PM and the organization.

PMI's Process Groups (Initiating, Planning, Executing, Monitoring and Controlling, and Closing) are simply ...groups of processes... or types of work grouped together into a category. Initiating processes start things (the project or a phase). Closing processes wrap things up (the project or a phase). Planning processes develop plans, executing processes execute those plans, and monitoring and controlling processes run in the background almost, constantly checking to be sure that we are properly following the plans and that they are working.

You can use the processes whenever you need them over the life of the project. Certainly you use planning processes a lot in the Planning Phase, but you use them throughout the life of the project when you are planning or re-planning anything. At the very end of the project when you are in the Closing Phase and deciding where to go for that last party, you are using a planning process.

It's a subtle and confusing distinction but once you grasp it, it will help with questions on the PMP exam and also questions like this good one about why processes are in one group and not another.

Because you do not execute scope, schedule and cost. You execute activities that will impact scope, schedule and cost. So, the place to put related process is Monitoring and Controlling process group.That is not the same with quality, resources, communications, risk, procurement and stakeholders where you execute things directly related to them.