Design single phase inverter using microcontroller jobs
I am looking for someone proficient in typing to convert content from a 30 page PDF into Word and Excel documents. The majority of the content wil...am looking for someone proficient in typing to convert content from a 30 page PDF into Word and Excel documents. The majority of the content will go in Word with a few items to be transcribed into Excel. Requirements: - High typing accuracy and speed - Familiarity with Word and Excel formatting Specific instructions: - For Word, the content should be formatted in Calibri 12 point font and single spaced. - For Excel, maintain one row per entry for optimal readability. Ideal candidates should have prior experience in similar data entry tasks. Familiarity with PDF conversion tools, text formatting, and spreadsheet management would ...
I'm looking for a skilled WordPress developer to convert my single page HTML portfolio website into a WordPress site. The main goal is to have my portfolio displayed in a user-friendly manner, and I have a design that I would like to be implemented. Key points to consider: - The design for the site is already provided. The chosen freelancer will need to convert this into a WordPress theme. - My website primarily serves as a portfolio for my work, so the focus is on showcasing images and descriptions in a clean, organized manner. - While I haven't specified any particular WordPress plugins to be used, I'm open to suggestions that could enhance the site's functionality and SEO. Ideal Skills/Experience: - Proven experience in WordPress theme develo...
...needs URGENCY. Specific Requirements: Can develop and create a System/Plugin, or a ready-made System/Plugin that can connect to our SPM word press system that can handle the following: - Automatic comparing and suggesting freight prices with multiple couriers - Reduce time to generate consignments - Real Time tracking for all couriers in a single screen - Connect to all Australian Courier's API that we are currently using - Can ADD, UPDATE, and DELETE couriers - Manually printing of consignment Labels - Similar in functions to software's like Machship and the like Additional Requirements: - Proficiency on responsiveness of the theme and cross-browser compatibility. - Attention to detail and ability to follow a detailed plan. - Very...
We're looking for someone experienced in installing SSL certificates on Azure hosting. We run two .NET based sites on a single Azure instance - they are: We have control of the domain, but need to work with our client for control of the subdomain. We will purchase a multi-domain Comodo SSL certificate from NameCheap (potentially a new PositiveSSL Multi-Domain certificate again) and have you activate it and install it on the Azure service. The current SSL is due to expire on the 28th May 2024. Key Requirements: - Install the SSL certificate on an Azure instance hosting my two .NET sites. - Ensure that both sites are configured to
I'm looking for a skilled professional to simulate & test of my microcontroller based hardware design, using proteus and test its performance. Also, if there is any performance bugs, need to correct it and also, build pcb prototype and physically test the performance
Hi ? I'm seeking a website designer who is experienced using the Vev page builder to create engaging animated web pages using some horizontal scrolling along with other animations and interactive features within Vev. I'm building an exciting new social networking concept on WordPress at but I want to redesign my Home and About pages to be as engaging and interactive as possible, using scrolly-telling to explain the various features and benefits of the platform. Please reply with the best rate you can to redesign my homepage and about page in Vev to compellingly tell the story about my platform and its features, benefits, mission and purpose. I don't really have any reference design to show, so you will be using your own creativity for ev...
Create single page web site design HTML5 CSS3 see attached file
This is a color 8 1/2 by 11 flyer. Most creative design wins. ````````````````````````````````````````````````````````` (this is bold and stand out fonts) (Your) Journey of the Soul Who hasn’t wondered what happens when we die? We know what happens to the body. But what happens to the soul? Is there really a “better” place after this one? Do our loved ones continue to connect with us? At once practical and powerful, reflective and relatable, Journey of the Soul teaches a Jewish perspective on life that begins before birth and lasts well after a person’s passing. (this is bold and stand out fonts) "The next chapter of (your) soul's life is way more important and longer lasting, so shouldn't it get the serious atten...
...layer with a single linear motor for forward and backward movement. We have a basic frame design already established but need a designer to refine and enhance the aesthetics to match our modern and high-performance simulator systems. Responsibilities: -Design a visually appealing, modern, and sleek housing for the traction loss platform that complements the existing frame design. -Ensure that the housing facilitates easy access to the mechanical components for maintenance and adjustment without compromising on style. -Collaborate with the engineering team to integrate technical specifications and ensure the housing accommodates all mechanical movements (left-right and forward-backward) efficiently. -Create CAD drawings and 3D models that reflect the intende...
...Magento website. - Creating backup files that encompass all necessary aspects of my website. - Completing a full site transfer using the created backup files to preserve integrity and functionality. You must have: - Expertise in website migration, particularly Magento sites. - Proficient knowledge in creating and using backup files. - Familiarity with hosting environments, specifically VPS. - Strong understanding of Magento 2. I am open to guidance on best practices for site transfers and backup file creation. This project requires a careful and knowledgeable freelancer, who can ensure a smooth and successful website transfer. Need help with setting up a Magento site using back up files. The freelancer should be able to do the following: - Help me set up my h...
I'm looking for a professional programmer who specializes in IC programming, specifically for smoke detectors. Key Tasks Include: - Reading and writing IC data for smoke detectors. - Handling and operating microcontroller IC chips effectively. The ideal candidate should have: - Solid experience in IC programming. - In-depth knowledge of microcontroller IC chips. - An understanding of smoke detector systems is a plus. Knowing how to troubleshoot and debug chips will offer a huge advantage. Please respond with examples of related projects you've completed and your approach to tasks like this.
I am looking to hire a professional video producer who is experienced in creating engaging videos for talk show podcasts. Ability to produce video with a single host format is a must. Key aspects of the project include: - Creating an engaging intro to set the stage for the podcast episodes - Working with transitions between various segments - Incorporating appropriate background music to match the tone and tempo of the discussions Ideal candidates would have a keen ear for music, a good sense of timing for transitions, and an eye for aesthetic visual details. Those with direct podcast video production experience would be preferred.
I'm looking for a IoT/WSN security professional to address a Hatchetman attack vulnerability on a RPL protocol network using 6LoWPAN technology. The goal is to implement two robust security solutions that to prevent hatchetman attack occurrence in RPL routing protocol. Ideal Skills and Experience: - In-depth understanding of RPL routing protocols, Contiki 3.0 and Cooja Simulator - Hands-on experience with 6LoWPAN wireless technology - Proven expertise in IoT/WSN solution design and implementation Key Tasks: - Implement Hatchetman attack in Contiki 3.0 - Implement Resolution of Hatchetman attack using 2ACK scheme. - Implement Countermeasure to Hatchetman Attack using Multiple Encryption - Evaluate the two solutions with each other and with the standard R...
...with integrating APIs from various service providers - Prior work with AI agent integration, especially in a marketplace setting - Strong communication to understand the omnichannel support required - Design skills for an intuitive and attractive in-app experience NOTE THE ABOVE DESCRIPTION WAS AUTO CREATED BY Freelancer, but I found it might be usefull. = SPEC-01: AI-Powered Auto-Broker Application Development - MVP == Background This project involves developing an MVP for an AI-powered buyers' agent auto-broker app using FlutterFlow and completing an existing partially completed app design(see images). Developer should be able to integrate existing tools and services to maximize development speed and cost efficiency, laying the groundwork for more advanc...
...expertise in Core PHP or Laravel to assist me. Key Project Details: - The website will be a single vendor system, specifically designed for the real estate sector. - Since it's a new project, we're open to your expertise on whether we should work with Core PHP or Laravel. Your Role: You will be responsible for developing the entire website. This includes designing a user-friendly interface, ensuring smooth functionality, and implementing necessary features for a Real Estate platform. Skills Needed: - Proficient in Core PHP or Laravel - Prior experience in creating dynamic websites, particularly in the Real Estate sector, is a huge plus. - Strong understanding of website development and a keen eye for design. Please let me know whether you have a prefere...
I'm looking for a 5kW solar inverter specifically designed for residential usage. It should be equipped with a battery backup system to ensure continuous power supply during outages. Key Requirements: - 5kW Power Output: The inverter should be capable of handling 5kW of power, suitable for residential usage with inductive loads. - Battery Backup Compatibility: It must be designed to work with a battery like lead acid and LifePO4 battery of 48V which will be a 16 string LifePO4 battery.. This is crucial for ensuring uninterrupted power during times of outages or low sunlight. -Tgere whouxl be an lcd screen to do settings and check status. - Residential Suitability: The inverter should be designed for residential environments, taking into account factors like spa...
I need a skilled developer to create a simple HTML file that prints 'Hello World @sainath_reddy' in any language. This file will be hosted on Azure Cloud using extended support services. I have a DNS and would like the deployment to be done on that DNS. The specific requirements are as follows: - Develop a single HTML file with 'Hello World @sainath_reddy' output - Host and deploy the file on Azure Cloud - Utilize extended support services for the hosting - Ensure deployment is done on my own DNS There's no need for a continuous deployment setup, as this is a one-time deployment. Ideal skills for this project include: - Proficiency in HTML - Experience with Azure Cloud services - Understanding of DNS and deployment processes - Ability to create a ...
...Administration User (up to 5) of these Entities: o “Place” providing following info: Name, Description, Photo, Position (shown with a marker on a map) o “Service” providing following info: Name, Description, Photo, Minimum Number of User necessary to provide the service. o “Events” providing following info: Name, Description, Photo, Place (selected among the place defined by the Administrator itself) (single choice. 1 to 1 link), Services (multiple choice. 1 to many link), Date and Time, Minimum Number of User needed to support the Event - Creation of “Access Pass” in pdf format for each User with User Name, Surname, QR code, Dates and Events - Administrator Dashboard showing Number of user registered, Events, Services, Places, Cal...
I'm in need of a large 24x36 inches family portrait illustration that looks like an impressionistic painting. The piece is unique in that I'm looking to merge all t...family members into one image. This is particularly important as some of the family members have passed away. The illustration should still be recognisable as each individual but seamlessly integrated into the unified whole. Ideal skills for this job: - Proficiency in Impressionistic style of painting - Experience in creating large format illustrations - Ability to merge multiple subjects into a single harmonious composition - Sensitivity and understanding of the emotional significance of this project I have labeled grandmother, grandfather children Tyrone (children twins Ari and Ady) and his sister Candi...
Hello I need an experienced programmer willing to take a project that requires attention to detail and precise understanding of the subject matter. I can give ex...attention to detail and precise understanding of the subject matter. I can give extensive details about the ideal functioning of the spreadsheet I need done, however, this is an overwview: Track all gross/net profits track all account balances track all bank balances track all ongoing and completed bets on each account track across futile types of bet single and sequenced (this will require custom logic) as well as more basic things. im looking of a single place for everything to happen and for the right person to create it. No work will need to be done with external API this is only an internal management and a...
...need to be able to register for an event. - A staff member need to be able to manage kids with there presents, global and session feedback, communicate with parents and manage their exercices (préparation and adjustments during the sessions). - The user interface needs to be multilanguage. At the beginning all the user interface will be in French. All translations will be provided. - In a later phase the staff module must be extended and a few articles (like t-shirts) must be online offered at a fix price. - The web app must be integrated or overlap with the website (). - I have basic programming skills (a lot of years ago) so transfer knowledge and support after go live are important for me....
I'm seeking an experienced civil engineer to create a detailed plan for a single-story commercial building I'm developing in Bunnell, FL. The structure will be utilized as office space. Key Tasks: Utilizing the current design IF POSSIBLE, Create official stamped plans that include the stormwater, parking and landscaping that can be sent in for permit. Everyone I have found locally is too busy to take on such a small task, they are working on major housing developments. I have already obtained clearance from Saint Johns River Water Management (see attached). Create - Develop a comprehensive parking lot design that is suitable for the intended purpose and adheres to local regulations. - Design landscaping that not only enhances the aesthetic appea...
...professional and corporate design. Key Features: - User registration and login - Advanced transaction functionality for enabling complex trades including options, futures, and derivatives Ideal Candidate: A developer with a good understanding of professional web design and familiarity with the stock market trading landscape in order to execute complex transactions on the platform. Prior experience in developing and working with financial technology will be highly valued. Design Preference: - The design should be clean, professional, and cater to a corporate audience. It should facilitate easy navigation and user-friendly transaction processes. I am looking for the professional team and in terms of milestones I will agree with only 2 milestones Milest...
I'm seeking a skilled professional to help me set up a WhatsApp API account for a chatbot, capable of supporting...support: The chatbot should be capable of supporting multiple languages. Ideal Skills/Experience: - English or Spanish speaking persons - Proven WhatsApp API experience in more than 2 projects - Proficiency with WhatsApp API - Experience setting up chatbots, ideally multilingual ones - Strong understanding of chatbot platforms and tools - Familiarity with configuring multiple phone numbers in a single WhatsApp API account Your role will be crucial in ensuring the successful configuration of the WhatsApp API account and the integration of the chatbot, accommodating multiple languages. A professional who can efficiently complete these tasks with attention to detai...
I'm looking for a ski...looking for a skilled React developer to assist in the creation of a single-page application with specific features. Key Responsibilities: - Develop a single-page application with a focus on user authentication. - Implement a broadcast and group creation functionality on the application. - Integrate a Whatsapp-based template broadcast feature. Ideal Skills and Experience: - Proficient in React development. - Previous work involving user authentication functionalities. - Experience in implementing broadcast and group features. - Familiarity with integrating Whatsapp API for template broadcasts. This is a unique project that will require a developer with a keen eye for detail, as it involves the creation of a seamless single-page applicati...
...(host, port, username, password). The developer will implement logic to format the estimate data using an EmailJS template and send it using the EmailJS API. 5. Local Data Storage with IndexedDB: The application will utilize IndexedDB for persistent storage of estimate data. The developer will implement functions to: Open or create the IndexedDB database. Add, update, and delete estimate data within the database. Retrieve estimate data from the database when the application loads or when needed. 6. Image Capture using MediaDevices API (iPhone): The developer will leverage the API to capture images from the device camera (focusing on iPhone users for this initial phase). Upon user interaction, the API will be used to request camera permission and ca...
I'm looking for an architect to design building plans for an 18 foot habitation box for my expedition vehicle, ensuring it's equipped with all necessary systems for a comfortable journey. Key Points: - **Power System:** It's crucial that this habitation box has a reliable and versatile power system. I need it to include solar panels, a battery bank, and a generator. The architect should ensure that these systems are integrated seamlessly within the design, considering factors like space, weight distribution and ease of access for maintenance. - **Water System:** The design should factor in space and weight considerations for the habitation box's water system. I'd like to have a freshwater tank, greywater tank, and a water filtration system i...
...Project Requirements: - Data Handling: The application should be able to import and use cryptocurrency data from this Kaggle dataset: Binance Full History. - Signal Processing: Integrate Fourier transform and other signal processing techniques to analyze the data. - Model Implementation: Develop and train the LSTM neural network model to predict potential buy and sell points. - User Interface: Design a user-friendly GUI that displays graphs, essential text-based information, and allows users to easily switch datasets. - Development Environment: The entire application must be developed in Matlab. - Project Timeline: You will have one month to complete this project from the date of commencement. Deliverables: - Complete source code of the application along with documentation. - ...
Automated report using dashboard in Excel The report interface should be similar look to the pic attached. The Excel file for data source should be able to be used for Power BI. Two dashboards: 1- for multiple project management status reporting 2- for ad-hoc task management The data source is in an Excel sheet with a manual entry
I'm looking for a skilled professional who can create a 1-minute live video on our website. This live video will be streamed using the front camera and will serve as a product demonstration. The ideal candidate for this project should have experience in: - Video production and live streaming - Web development (to integrate the video on our site) - Understanding of live video interaction features Key requirements: - Create a 1-minute long live video - Use the front camera - Support real-time comments - The video should be engaging and visually appealing - Ability to optimize the video for web streaming - Ensure the video is compatible and functional across different web browsers - Deliver a product demonstration that is clear and concise - Implement interactive elements to enh...
I'm in need of a skilled professional who can create a live video for me. This video will specifically cater to my corporate conference and will be used on Reels and YouTube shorts. The main focus of this video will be on the audience interactions rather than the typical keynote speeches or panel discussions. Key requirements: - Creation of a live video for a corporate conference - Emphasis on capturing and showcasing audience interactions - Targeting Reels and YouTube shorts for the final video Ideal skills and experience for the job: - Proven experience in creating engaging live videos - Understanding of the dynamics of corporate conferences - Ability to highlight audience interactions in a compelling way - Familiarity with the format and requirements of Reels and YouTube short...
I'm in need of an experienced IoT device developer to create a production-level device specifically tailored to calculate current flowing through a phase in a transformer. Ideally, the skill-set of the successful freelancer will include: - Experience with ESP3266 and clamp current sensor. - Expertise in the development of IoT devices that can perform real-time monitoring. - Capable of crafting a solution that concentrates specifically on current level monitoring. - Should be more efficient and accurate current flow value - AWS iot core experience will advantage - Open for suggestions for production level. This project could potentially roll into a long-term contract depending on the success of the initial task. So, if you have the skills and experience, please place your bi...
I'm in need of a seasoned Apache Solr professional to help me implement search functionality for my project. The ideal candidate has excellent expertise in Apache Solr and can effectively optimize search functionality for text documents. Key responsibilities: - Upgrade from Apache Solr 3.6 to a version supporting wildcard search, Windows server - Multi cores with replication - bulk import via CSV - core creation/deletion across master and slaves Ideal skills and experience: - Prior experience implementing Apache Solr for search functionality - Proficiency in data indexing and faceted navigation with Apache Solr - Strong understanding of optimization techniques for search functionality - Excellent problem-solving and analytical skills - Good communication and collaboration abilities
What to create: Data from a live webpage in JSON format must be read upon the click of a button (BUTTON "1"). The data will be loaded into a nice looking list with 4 columns. The 4th column is a button (BUTTONS "3") which when clicked, a javascript function will execute. There is also a button ("2") and a text box named exclude. When button 2 is clicked, the above function is execu..."3") which when clicked, a javascript function will execute. There is also a button ("2") and a text box named exclude. When button 2 is clicked, the above function is executed as a batch for ALL rows of the list EXCEPT the one in exclude text box. The javascript function is already written. The JSON data will be provided upon agreement of the project. The fin...
...interface design. - Ability to create scalable, secure, and maintainable code. - Excellent teamwork and communication skills, as this project will require close collaboration. Dev team required to develop a recruitment related web application for desktop and phone (design to completion) Whereby; candidates can create a profile upload their CV, images or link to images and videos recruiters can search CVs with a Boolean type search functionality & save searches. Candidates and recruiters can message each other. Admin can manage the back end. Suggested technical skill set but not a complete one… • Cloud-based server solution • Azure or Single server solution • MS SQL Database (NoSQL document database might be more appropriate?) • O...
...~$400-$450/month on 1k words/day ~$800-$900/month on 2k words/day ~$1200-$1350/month on 3k words/day ~$1600-$1800/month on 4k words/day *Flexibility: No Skyping, no phone calls, accept projects when you have the time to complete them, take time off when you need (letting us know in advance is good practice). *Easy to work with: We reply to questions fast, will provide valuable input and feedback on every single task you complete. *We've been in the content writing and marketing business for 15 years and have worked with more than 2000 clients. As part of our team, you'll have the opportunity to learn from experienced team members on a daily basis. What we expect: *You'll be part of an International team with a base in Serbia that works for many clients which ...
I'm seeking a CAD specialist to assist with the design of heat-exchanger plates and the subsequent press tool mold. The ideal candidate should be an expert in this area and have a strong background in CAD design, specifically in the creation of intricate, detailed designs. Key Requirements: - Drawing of complex heat-exchanger plates: You'll be provided with the geometry, and your task will be to create detailed CAD drawings in STEP format. These must be highly detailed and tailored towards the design of the press tool mold. - Design of press tool mold: Using the drawing of the heat-exchanger plates, your next task will be to design a press tool mold. The specifics of this mold, such as whether it should be single or multi-cavi...
Need a multi user login where multiple users can connect to my server and access the server using apache gaucomole. It has to be scripted (csh) based as I need to execute on local machine once it is working.
I'm seeking a skilled Python developer proficient in Selenium or other scraping tools, AI and others API integration. The main tasks in this project include: - Integrating APIs: You'll be responsible for seamlessly integrating the following APIs: - Send/reveive data from trained AI - Collect data using scraping - Payment Gateway - Other websites: API to integrate with other websites - Developing B2B Features: We're looking to expand our platform to cater for B2B transactions. Your role will be to create and incorporate features that facilitate B2B interactions. Key skills and experience required: - Proficient in Python - Experienced with Selenium or other scraping tools - Proven track record with API integration - exchange data with AI I'm look...
...redesign. The purpose of the single page document is to clearly show our easel users the different "T-Bar Arm Configurations" for attaching different size and shapes of canvas to our rotating easels. We refer to it as a "cheat sheet". Key Responsibilities: - Redesigning an existing document to have a professional, clean look - Ensuring the document remains instructional and easy to follow - Change over logo from "artristic studio" to "artristic rotating easels" (see attached) - Update minor text changes - Refer to our website and social pages @artristiceasel for design inspiration - Providing the final design in PDF format Ideal Skills and Experience: - Graphic design with experience in creating instructional documen...
I require a proficient and ClickUp builder to automate critical steps in our client acquisition process. The intention is to minimize manual intervention while enhancing our efficiency considerably. Key Tasks: - Designing and implementing an automated system that effectively captures and tracks leads: For now, our website captures leads through a contact form, and we want this process to be automated. - Integrating with our current email marketing service: Currently, we use MailChimp for email marketing. Thus, experience in MailChimp integration is a plus. - Tailor-made sales funnel automation: The new workflow must streamline our sales funnel to ensure a smooth transition from leads to potential clients. Skills and Experience: - Excellent in and ClickUp - Past experience in lead c...
I am searching for a skilled graphic designer with a knack for vintage aesthetics to create a unique monochromatic logo for my brand. Ideal Skills and Experience: - Extensive experience in logo design. - Proficiency in creating vintage styled graphics. - Ability to design striking monochromatic logos. Project Details: - The logo should be uniquely vintage in style, a nod to timeless aesthetics. - The color scheme should be monochromatic, making use of different shades and tints of a single color. - The end result should be a branding that encapsulates and enhances the identity of my brand. Your expertise in creating logos with an antique charm will be instrumental in this project.
...intermediate level telecallers to help with outbound event reminder calls. Here are more details regarding the project: • Type of Calls: The primary responsibility will be to make outbound calls reminding UK based school's decision makers (Principal, HODs and deans) about an upcoming event. • Number of Telecallers: This project requires 1-2 telecallers. If you have a team, great! If you're a single telecaller, still apply. As long as you're organized and can handle the volume, we're interested. • Experience Level: Ideally, you should have an intermediate level of experience in telecalling. It's important that you're comfortable handling outbound calls and possess good communication skills and most importantly a neutral british acc...
I'm seeking a talented graphic designer to crea...seeking a talented graphic designer to create an illustrative flyer to raise awareness for an important cause. Key Requirements: - Proficient in graphic design, with a focus on creating compelling and visually appealing designs - Experience in designing flyers, with a portfolio that showcases your ability to combine powerful imagery and text in a single, impactful design - Strong understanding of the principles of design and how they can be used to communicate a message effectively The ideal candidate should be able to create a design that is not only visually engaging but also effectively communicates the core message of the cause. The design should be able to capture the audience's att...
I'm seeking an experienced software developer to execute Single Sign-On (SSO) integration between Microsoft Active Directory and Office 365. Key responsibilities: - Implement and configure SSO - Ensure secure and seamless connection between Microsoft Active Directory and Office 365 Ideal candidate: - Extensive experience in SSO integration - Strong expertise in Microsoft Active Directory and Office 365 - Prior work in ensuring secure integrations and solving related issues. The aim is to provide users with a secure, efficient, and seamless experience. Your ability to deliver this on-time without compromising on security or performance will be the defining measure of success.
Want to develop fantasy gaming app Single game like 3 pokar card and choose one There is user registration Wallet Rewards systemadmin panel
We are in need of a developer to create a single screen for our ERP system using ASP.NET Core 7 with Angular on the front end. This screen will display a chart of accounts, and proficiency in implementing it using a tree concept with an indefinite number of levels is required. Several critical considerations must be addressed during the development of this screen: Utilization of JSON files to support three languages: English, Arabic, and French. The developer is not expected to perform translations but must manage all text within the screen using JSON. Adherence to our established standards for themes, designs, etc. Incorporation of our standard methods to link the screen to the project, such as search and filters. Successfully delivering the screen accordi...
...architect to design a single-story building for services with a contemporary style. The project will involve creating both the floor plan and exterior design. Key Requirements: - Architectural Floor Plan: You'll be required to create a comprehensive floor plan that maximizes space and functionality. The layout should be suitable for a single-story residential building. - Exterior Design: The design should reflect a contemporary style, incorporating modern elements and aesthetics. Ideal Skills and Experience: - Proven experience in residential architectural design, especially single-story buildings. - Strong understanding of contemporary architecture, with a portfolio that showcases similar projects. - Proficiency in using...
