Management Information System

I’m trying to prepare one job referrance letter based on my previous job that i had in 2003. I have write down all my duties and activities, I need your help to check grammer or spelling mistakes and any correction that you can make for look like perfect without any error. Many thanks as advance.

Directed and managed IT department include a team of 13 IT employees and various computer-related activities of company. Consult with users, management, vendors, and technicians to assess computing needs and system requirements. Responsible for the computer systems within company, overseeing installation, ensuring back up systems operate effectively, purchasing hardware and software, providing the ICT technology infrastructures for organization, and contribute organizational policy regarding quality standards and strategic planning.

Roles and Responsibilities

• Plan, organize, direct, control and evaluate the operations of information technology systems; Develop and implement policies and procedures for data processing and computer systems operations and development;
• evaluate user needs and system functionality and ensure that ICT facilities meet these needs;
• plan, develop and implement the ICT budget, obtain competitive prices from suppliers where appropriate, to ensure cost effectiveness;
• schedule upgrades and security backups of hardware and software systems;
• research and install new systems;
• ensure the smooth running of all computer systems, including anti-virus software, print services and email provision;
• ensure that software licensing laws are adhered to;
• provide secure access to the network for remote users;
• ensure the security of data from internal and external attack;
• provide users with appropriate support and advice;
• manage crisis situations, which may involve complex technical hardware or software problems;
• mentored and trained new ICT support staff;
• Design and administer Organization’s local area network
• Evaluate the organization’s technology use and needs and recommend improvements, such as hardware and software upgrades.
• Meet with organization’s heads, managers, supervisors, vendors, and others, to solicit cooperation and resolve problems.
• Review project plans in order to plan and coordinate project activity
• Control the budget and expenditures of the Organization’s projects

First, I’m not a resume expert. Overall, it looks good, but here are a few grammar/punctuation things:

First paragraph: If you are going to start out in past tense (-ed), stay that way. You started with "directed and managed," so in the 2nd line put "consulted," or just put "Direct and manage"
First paragraph (2nd to last line): Put a semicolon after organization, and say "contributed to" instead of contribute (I think you forgot the word "to"). Use "contribute to" if you are going with present tense.

1st bullet point: "Develop" should be a lower case ‘d’ as in "develop."
3rd bullet point: Remove "where appropriate,". It’s unnecessary.
7th bullet point: Use "ensure adherence to software licensing laws". Formal English still doesn’t allow a preposition to end the sentence.
12th bullet point: You switched to past tense again.
13th bullet point: Since you didn’t capitalize Organization in the next bullet point, don’t do it now. Just use "the organization."
16th bullet point: Find something different for "heads." Maybe try executives?
17th bullet point: Same thing with Organization; pick one and stick with it.