Authority
Authority is the best choice. Authority is the right to apply project resources and make decisions within the project. These decisions could include quality acceptance, selection of the method for completing an activity, and how to respond to project variances. [PMBOK® Guide 6th edition, Page 318]
Asserting one‘s viewpoint at the expense of others
Project managers must resolve conflicts as early as possible to improve productivity and generate positive working relationships. Forcing is a conflict resolution technique in which one’s viewpoint is asserted at the expense of others. [PMBOK® Guide 6th edition, Page 349]
Try to use management influence to obtain the resource’s time
Contacting the manager once again will not help since you have already had a poor response. The best option is to try using management influence to obtain the resource’s time for your project. Should all efforts to obtain the resource prove unsuccessful, alternatives include planning for an alternate resource or training another resource. [PMBOK® Guide 6th edition, Page 330]
A constraint that limits the resource planning process
Constraints can limit the flexibility of the resource planning process. Collective bargaining agreements—contractual agreements with unions or other employee groups—can require certain roles or reporting relationships. The project team may not have direct control over collective bargaining agreements. [PMBOK® Guide 6th Edition, Page 329]
Resource calendars
Resource calendars track the availability of team members for team development activities. The responsibility assignment matrix describes the responsibilities assigned to various team members. Project staff assignments give details of individual assignments, and project organization charts display team members and their reporting relationships. The project charter does not supply any of that information. Hence, Lesley must use resource calendars to know that information. [PMBOK® Guide 6th edition, Page 323]
Intelligence quotient
Intelligence quotient (IQ) is an assessment of an individual’s intelligence. This is not a soft skill. Soft skills are an individual’s interpersonal skills. [PMBOK® Guide 6th edition, Page 357]
Talk to the lead developer in private and try to understand the reasons causing this behavior.
The scenario doesn’t tell us the actual reason behind the resource’s behavior. As the project manager it is your responsibility to uncover the reason before taking any action. As the first step, you need to talk to the resource in person and try to understand the reasons causing this behavior. [PMBOK® Guide 6th edition, page 348]
Co-location
In collocation, all the team members are brought together physically, such as in a team meeting room. Collocation is a highly recommended project management practice. [PMBOK® Guide 6th Edition, Page 340]
Training by observation, conversation, and project management appraisals
Unplanned training takes place in a number of ways that include observation, conversation, and project management appraisals conducted during the controlling process of managing the project’s team. [PMBOK® Guide 6th edition, Page 342]
Analyze the variability of the hiring process and recruit the resources just in time.
If the required resources are not hired in time, neither fast-tracking nor crashing will help the project. If the hiring process is time-consuming and highly variable, you need to carefully analyze this and initiate the hiring process just in time based on this analysis. [PMBOK® Guide 6th edition, pages 215, 328]