Applying communication frameworks and analysis loopholes to prepare a Report

Situation:
One day I was called by my manager over phone, while working on a project, and she wanted me to
lead a new project.
Listening to my manager's words I got elated, as this was the first time I would be leading the project
so immediately said yes and in excitement missed half of the requirements. She clearly explained me
the requirements that we are required to work on the key 50 reports of XYZ folder but I interpreted
that we have to work on all reports of XYZ folder. As in total, there were 250 reports.
My manager again dropped me a mail and clarified that we have to work on the reports of the XYZ
folder, so provide me an estimate with the number of members and days required for accomplishing
this task.
It took me around two days to analyse and later provided the plan that that we need three more
members and twenty days to complete the task.
In my detailed analysis, I assumed that we can do four reports per day, so a total of four people can
complete 250 reports in fifteen days and will have three days for the testing team to verify and later
two days for the customer to validate.
As requested, I was allocated a three-member team and with whom I was working for the first time
and was not aware about their skills. But with the time constraint, I thought everybody would be
completely aware about the tool so blindly allocated task to them. But unfortunately, one of the
team member who was new to this tool and moreover did not share this info with the team. But
with his struggle of 3 to 4 days he overcome gradually.
Eventually, not only the project was delayed by ten days but also when we had the customer
validation, they were in complete shock with the project deliverable as we were required to work
only on 50 reports not entire 250 reports, consequently led to the rework of all 200 reports that
caused huge loss in terms of time and cost.
Analysis:
Throughout this situation, there has been lot of loopholes in the communication process that I am
analysing with the help of Active Listening and Perceptual model whereas I am using Growth
Mindset model to illustrate the strengths of my communication.

Usage of Models and framework to determine strengths and weakness of communication
 Strength

1. Growth Mindset: As accepted the opportunity to work on.
 Weakness

1. Active listening: Due to excitement, I misinterpreted the entire requirement
that lead to the huge loss of time and money.
2. Perceptual model of communication: Interpreted that we have to work on all
reports and did not verified with the manager for the exact requirement.

Recommendations:
Usage of Models and framework to provide recommendation.
1 Should verified the exact requirement by communicating over phone and via email.
2The Grow Model (Once realised that the one of the member is struggling should have
provided training but avoided due to time constraint).
3 Active Learning cycle
4 Johari Window (to analyse the skills of the team member) /* Something about it; as I am
mentioning about the struggle of a member in learning new tool; delays project for 5 days.
Whereas, half of the day, If could devoted to analyse with Johari window; would have saved
4.5 days.
{But with the time constraint, I thought everybody would be completely aware about the
tool so blindly allocated task to them. But unfortunately, one of the team member was new
to this tool and moreover did not share this info with the team. But with the struggle of few
days he learned gradually}